Power management for an implantable device

ABSTRACT

Techniques for facilitating improved power management for an implantable device are provided. In one example, an implantable device includes a telemetry circuit and a power management circuit. The telemetry circuit is configured to facilitate a telemetry session between the implantable device and an external device. The power management circuit is configured to connect a power supply to the telemetry circuit via a first current-limiting device based on a determination that the telemetry circuit satisfies a defined criterion. The power management circuit is also configured to connect the telemetry circuit to a second current-limiting device based on a determination that the telemetry circuit is connected to the first current-limiting device for a defined period of time.

RELATED APPLICATIONS

This application claims the benefit of the filing date of a U.S.Provisional Application Ser. No. 62/464,731, filed Feb. 28, 2017, whichis incorporated herein in its entirety.

TECHNICAL FIELD

This disclosure relates generally to implantable devices and, moreparticularly, to systems, apparatus, methods and computer-readablestorage media that facilitate power management for an implantabledevice.

BACKGROUND

Modern healthcare facilitates the ability for patients to lead healthyand full lives. Implantable medical devices (IMDs) are often utilizedfor such medical advances. For example, IMDs such as pacemakers,implantable cardioverter-defibrillators (ICDs), neurostimulators, anddrug pumps can facilitate management of a wide range of ailments,including, but not limited to, cardiac arrhythmias, diabetes, andParkinson's disease. Patients and medical care providers can monitor theIMD and assess a patient's current and historical physiological state toidentify and/or predict impending events or conditions. This monitoringoften involves frequent communication with respect to the IMD.

Implantable devices, including IMDs, are increasing in complexity whileshrinking in size. One hurdle to achieving such small and highlyfunctional devices is efficient power management of these devices. Inparticular, many implantable devices operate from power sources thathave a limited lifespan and/or are not rechargeable. As such, after theimplantable device is implanted within the human body and the lifespanof the power source has been reached, the implantable device may need tobe removed. Numerous processes associated with an implantable devicedirectly impact life of a power source of the implantable device. Forexample, a communication connection process between an implantabledevice and an external device can unnecessarily drain power from a powersource of the implantable device if not properly managed. Moreover,impedance of a power source included in an implantable device mayincrease or decrease throughout a lifespan of the implantable devicebased on conditions associated with the implantable device (e.g.,storage conditions of the implantable device, use conditions of theimplantable device, etc.). Therefore, voltage of the power sourceincluded in the implantable device can also vary. In certain scenarios,variation of the voltage of the power source can result in a low voltagecondition (e.g., a battery voltage droop) for circuitry of theimplantable device. Thus, extending life of a power source of animplantable device and/or reducing occurrence of certain electricalconditions for circuitry of an implantable device by providing improvedpower management is highly desirable

SUMMARY

The following presents a simplified summary of one or more of theembodiments in order to provide a basic understanding of one or more ofthe embodiments. This summary is not an extensive overview of theembodiments described herein. It is intended to neither identify key orcritical elements of the embodiments nor delineate any scope ofembodiments or the claims. Its sole purpose is to present some conceptsof the embodiments in a simplified form as a prelude to the moredetailed description that is presented later. It will also beappreciated that the detailed description may include additional oralternative embodiments beyond those described in the Summary section.

Embodiments described herein include systems, methods, apparatuses andcomputer-readable storage media facilitating improved power managementof an implantable device. Although the term “implantable device” is usedherein, it is understood that in different embodiments, the implantabledevice can be an IMD. In some embodiments, the implantable device is orincludes an IMD. As such, “implantable device” and “IMD” can be usedinterchangeably herein and all such variations on embodiments areenvisaged. In other embodiments, the implantable device is or includes adevice configured to interact with an IMD. In these embodiments, theimplantable device can be implanted within a patient or can be employedexternally from or on a body of a patient. Additionally oralternatively, both the implantable device and/or the IMD can beimplanted within a patient.

In embodiments described herein, an implantable device can comprise apower management circuit to control current and/or voltage provided to atelemetry circuit of the implantable device. The power managementcircuit can provide, for example, a soft-start sequence ofcurrent-limiting devices to control current and/or voltage provided tothe telemetry circuit of the implantable device. In an embodiment, thepower management circuit can control the telemetry circuit through alifetime of the implanted device when the implantable device includes alimited power source. Furthermore, the power management circuit candetermine a state of a power source (e.g., a limited power source) ofthe implantable device and/or can control in-rush current provided tothe telemetry circuit by employing the soft-start sequence ofcurrent-limiting devices. The power management circuit can also controlthe telemetry circuit to improve functionality of the implantable deviceand/or the telemetry circuit. Additionally, the implantable device canalso perform continuous monitoring of a power source of the implantabledevice when the telemetry circuit of the implantable device ispowered-on (e.g., when the power source of the telemetry circuitprovides power to the telemetry circuit). In certain embodiments, thepower management circuit of the implantable device can disconnect thetelemetry circuit from the power source of the implantable device when adefined voltage condition is detected.

In one embodiment, an implantable device configured to be at leastpartially implanted within a patient is provided. The implantable devicecan include: a housing configured to be implanted at least partiallywithin the patient; a memory within the housing; circuitry, within thehousing, and configured to at least one of obtain sensed physiologicaldata associated with the patient or deliver a therapy to the patient; atelemetry circuit and a power management circuit. The telemetry circuitcan be configured to facilitate a telemetry session between theimplantable device and an external device. The power management circuitcan be configured to connect a power supply to the telemetry circuit viaa first current-limiting device based on a determination that thetelemetry circuit satisfies a defined criterion. The power managementcircuit can also be configured to connect the telemetry circuit to asecond current-limiting device based on a determination that thetelemetry circuit is connected to the first current-limiting device fora defined period of time.

In various different embodiments, the defined criterion can be a firstdefined criterion, and the power management circuit can be furtherconfigured to disconnect the telemetry circuit from the secondcurrent-limiting device based on a determination that a power supplycondition associated with the telemetry circuit satisfies a seconddefined criterion. In an embodiment, the first defined criterion can beassociated with a telemetry session with an external device, and thesecond defined criterion can be a defined voltage level or a definedcurrent level. In certain embodiments, the power management circuit canbe further configured to disconnect the telemetry circuit from thesecond current-limiting device based on a determination that a voltagelevel associated with the telemetry circuit satisfies a defined voltagelevel. In some embodiments, the power management circuit can be furtherconfigured to disconnect the telemetry circuit from the secondcurrent-limiting device based on a determination that a current levelassociated with the telemetry circuit satisfies a defined current level.In certain embodiments, the defined period of time is a first definedperiod of time, and the power management circuit can connect thetelemetry circuit to a third current-limiting device based on adetermination that the telemetry circuit is connected to the secondcurrent-limiting device for a second defined period of time. In someembodiments, the first current-limiting device, the secondcurrent-limiting device and/or the third current-limiting device can beresistors or constant current sources. In an embodiment, the definedcriterion can be a first defined criterion, and the power managementcircuit can be further configured to alter a duty cycle of the secondcurrent-limiting device based on a determination that power supplycondition associated with the telemetry circuit satisfies a seconddefined criterion. In another embodiment, the power management circuitcan be further configured to repeatedly monitor a voltage levelassociated with the telemetry circuit based on an initiation of aconnection between the telemetry circuit and the power supply via thesecond current-limiting device. Additionally, in an embodiment, thepower management circuit can be further configured to disconnect thepower supply from the telemetry circuit based on a determination thatthe voltage level satisfies a defined voltage level. In yet anotherembodiment, the power management circuit can be further configured todisconnect the power supply from the telemetry circuit based on adetermination that the telemetry circuit has failed to communicate withan external device. In some embodiments, the power management circuitcan be further configured to disconnect the power supply from thetelemetry circuit based on a determination that the telemetry circuithas failed to broadcast an advertising data packet. In some embodiments,the telemetry circuit can be further configured to communicate with theexternal device via a communication channel associated with acommunication protocol utilizing a level of energy consumption that isless than a defined threshold.

In another embodiment, a method is provided. The method can includefacilitating, using a telemetry circuit of an implantable device, atelemetry session between the implantable device and an external device.The method can also include connecting, using a power management circuitof the implantable device, a power supply to the telemetry circuit via afirst current-limiting device based on a determination that thetelemetry circuit satisfies a first defined criterion. Furthermore, themethod can include connecting, using the power management circuit of theimplantable device, the telemetry circuit to a second current-limitingdevice based on a determination that the telemetry circuit is connectedto the first current-limiting device for a defined period of time.

In some embodiments, the method can include disconnecting, using thepower management circuit of the implantable device, the telemetrycircuit from the power supply based on determining that the telemetrycircuit of the implantable device satisfies a second defined criterion.In another embodiment, the method can include altering, using the powermanagement circuit of the implantable device, a duty cycle of the secondcurrent-limiting device in response to determining that the telemetrycircuit of the implantable device satisfies a second defined criterion.In yet another embodiment, the method can include monitoring, using thepower management circuit of the implantable device, a power supplycondition associated with the telemetry circuit. Additionally, in someembodiments, the method can include disconnecting, using the powermanagement circuit of the implantable device, the telemetry circuit fromthe power supply in response to determining that the power supplycondition satisfies a defined power supply level. In some embodiments,the monitoring comprises repeatedly monitoring the power supplycondition associated with the telemetry circuit.

In yet another embodiment, another method is provided. The method caninclude determining, using a power management circuit of an implantabledevice, that a telemetry circuit of the implantable device satisfies afirst defined criterion. The method can also include disconnecting,using the power management circuit of the implantable device, thetelemetry circuit from a power source of the implantable device, whereinthe disconnecting is performed based on the determining that thetelemetry circuit satisfies the first defined criterion. Furthermore,the method can include determining, using the power management circuitof the implantable device, that the telemetry circuit satisfies a seconddefined criterion. The method can also include connecting, using thepower management circuit of the implantable device, the power source tothe telemetry circuit via a first current-limiting device of the powermanagement circuit, wherein the connecting is performed based on thedetermining that the telemetry circuit satisfies the second definedcriterion.

In some embodiments, the method can include connecting, using the powermanagement circuit of the implantable device, the telemetry circuit to asecond current-limiting device of the power management circuit inresponse to a determination that the telemetry circuit is connected tothe first current-limiting device for a defined period of time. In someembodiments, the determining that the telemetry circuit satisfies thefirst defined criterion comprises determining that a power conditionassociated with the telemetry circuit satisfies a defined powercondition. In some embodiments, the determining that the telemetrycircuit satisfies the first defined criterion comprises repeatedlymonitoring an electrical node associated with the telemetry circuit. Insome embodiments, the determining that the telemetry circuit satisfies adefined criterion comprises the determining that the telemetry circuitsatisfies the second defined criterion comprises determining that thetelemetry circuit is beginning a telemetry session with respect to anexternal device. In some embodiments, the determining that the telemetrycircuit satisfies a defined criterion comprises the determining that thetelemetry circuit satisfies the second defined criterion comprisesdetermining that the telemetry circuit is beginning a telemetry sessionassociated with broadcasting one or more advertising data packets.

In yet another embodiment, an apparatus is provided. The apparatus caninclude a telemetry circuit, a power source circuit and a powermanagement circuit. The telemetry circuit can be configured to perform atelemetry session with respect to a device. The power source can beconfigured to provide power to the telemetry circuit. The powermanagement circuit can be configured to connect the power source to thetelemetry circuit via a first current-limiting device based on adetermination that the telemetry circuit satisfies a defined criterion.The power management circuit can also be configured to connect thetelemetry circuit to a second current-limiting device based on adetermination that the telemetry circuit is connected to the powersource for a defined period of time.

In some embodiments, the apparatus further can include an implantabledevice circuit configured to generate medical treatment data associatedwith the apparatus. In some embodiments, the defined criterion can be afirst defined criterion, and the power management circuit can be furtherconfigured to disconnect the telemetry circuit from the power sourcebased on a determination that a power supply condition associated withthe telemetry circuit satisfies a second defined criterion. In someembodiments, the power management circuit can be further configured torepeatedly monitor the telemetry circuit based on an initiation of aconnection between the telemetry circuit and the power source. In someembodiments, the telemetry circuit can be configured to communicate withthe device via a communication protocol utilizing a level of energyconsumption that is less than a defined threshold. In some embodiments,the apparatus can be an implantable medical device configured to beimplanted at least partially within a patient.

In one or more additional embodiments, a system includes an implantabledevice and an external device. The implantable device can include atelemetry circuit and a power management circuit. The telemetry circuitcan be configured to broadcast one or more advertising data packets. Thepower management circuit can be configured to connect a power source tothe telemetry circuit via a first current-limiting device based on adetermination that the telemetry circuit satisfies a defined criterion.The power management circuit can also be configured to connect thetelemetry circuit to a second current-limiting device based on adetermination that the telemetry circuit is connected to the powersource for a defined period of time. The external device can beconfigured to perform telemetry communication with the implantabledevice based on the one or more advertising data packets.

In some embodiments, the power management circuit can be configured toconnect the telemetry circuit to the second current-limiting devicebased on a determination that the first current-limiting device isconnected to the power source for the defined period of time. In someembodiments, the power management circuit can be configured to alter anamount of current provided to the telemetry circuit based on thedetermination that the telemetry circuit is connected to the powersource for the defined period of time. In some embodiments, the powermanagement circuit can be configured to repeatedly monitor a powercondition associated with the first current-limiting device and thetelemetry circuit. In some embodiments, the power management circuit canbe configured to disconnect the telemetry circuit from the power sourcebased on a determination that the power condition satisfied a definedthreshold value.

Other embodiments and various non-limiting examples, scenarios andimplementations are described in more detail below. The followingdescription and the drawings set forth certain illustrative embodimentsof the specification. These embodiments are indicative, however, of buta few of the various ways in which the principles of the specificationmay be employed. Other advantages and novel features of the embodimentsdescribed will become apparent from the following detailed descriptionof the specification when considered in conjunction with the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a schematic diagram of an example, non-limitingimplantable device telemetry system facilitating improved powermanagement of an implantable device in accordance with one or moreembodiments described herein.

FIG. 2 illustrates a block diagram of an example, non-limitingimplantable device in accordance with one or more embodiments describedherein.

FIG. 3 illustrates a block diagram of an example, non-limiting system inaccordance with one or more embodiments described herein.

FIG. 4 illustrates a block diagram of another example, non-limitingsystem in accordance with one or more embodiments described herein.

FIG. 5 illustrates a block diagram of yet another example, non-limitingsystem in accordance with one or more embodiments described herein.

FIGS. 6, 7, 8, 9 and 10 illustrate flow diagrams of example,non-limiting methods facilitating improved power management of animplantable device in accordance with one or more embodiments describedherein.

FIG. 11 illustrates a block diagram of an example, non-limiting computeroperable to facilitate improved power management of an implantabledevice in accordance with one or more embodiments described herein.

DETAILED DESCRIPTION

The following detailed description is merely illustrative and is notintended to limit embodiments and/or application or uses of embodiments.Furthermore, there is no intention to be bound by any expressed orimplied information presented in the preceding Technical Field,Background or Summary sections, or in the Detailed Description section.

One or more embodiments are now described with reference to thedrawings, wherein like referenced numerals are used to refer to likeelements throughout. In the following description, for purposes ofexplanation, numerous specific details are set forth in order to providea more thorough understanding of the one or more embodiments. It isevident, however, in various cases, that the one or more embodiments canbe practiced without these specific details.

Additionally, the following description refers to components being“connected” and/or “coupled” to one another. As used herein, unlessexpressly stated otherwise, the terms “connected” and/or “coupled” meanthat one component is directly or indirectly connected to anothercomponent, mechanically, electrically, wirelessly, inductively orotherwise. Thus, although the figures may depict example arrangements ofcomponents, additional and/or intervening components may be present inone or more embodiments.

With reference now to the drawings, FIG. 1 illustrates a schematicdiagram of an example, non-limiting implantable device telemetry system100 facilitating improved power management of an implantable device inaccordance with one or more embodiments described herein. In theembodiment shown, implantable device telemetry system 100 includes animplantable device 104 associated with a body 102, and an externaldevice 116. In some embodiments, as shown, the implantable device 104can be an IMD that is implanted within the body 102. In anotherembodiment, the implantable device 104 can be separate from another IMD(not shown in this embodiment) that is also implanted within the body102 and communicatively and/or electrically coupled to the IMD. However,in another embodiment, the implantable device 104 can be an instrumentthat is employed externally from or on the body 102 (e.g., theimplantable device 104 can be a medical device that is not implantedwithin the body 102). In one example, the implantable device 104 can bean implantable pulse generator. In another example, the implantabledevice 104 can be implantable cardioverter-defibrillator. However, it isto be appreciated that the implantable device 104 can be a differenttype of implantable device. Embodiments of devices, apparatus andsystems herein can include circuitry and/or other hardware to facilitatetelemetry, power management, medical functions, diagnostic functionsand/or treatment functions with respect to the implantable device 104.Additionally or alternatively, certain embodiments of devices, apparatusand systems herein can include one or more machine-executable componentsembodied within one or more machines (e.g., embodied in one or morecomputer-readable storage media associated with one or more machines).Such components, when executed by the one or more machines (e.g.,processors, computers, computing devices, virtual machines, etc.) cancause the one or more machines to perform the operations described. Insome embodiments, the implantable device 104 can be configured tofacilitate one or more diagnostic functions or treatment functionsrelative to the body 102.

One or more embodiments of implantable device telemetry system 100 aredescribed in connection with facilitating improved power management forthe implantable device 104. The implantable device 104 can communicatewith the external device 116 via a telemetry circuit of the implantabledevice 104 (e.g., telemetry circuit 202 described below in connectionwith FIGS. 2, 3, 4 and 5). In certain embodiments, the implantabledevice 104 can communicate with the external device 116 using anadvertising data packet generated by the telemetry circuit of theimplantable device 104.

In an embodiment, the implantable device 104 can include a powermanagement circuit (e.g., telemetry circuit 202 described below inconnection with FIGS. 2, 3, 4 and 5) to facilitate improved powermanagement for the implantable device 104. For instance, the powermanagement circuit can include a switch that facilitates disconnectionof the telemetry circuit from a power source of the implantable device104. The power management circuit of the implantable device 104 can beemployed to mitigate power off synchronization with respect to the powersource and the telemetry circuit. Furthermore, the power managementcircuit of the implantable device 104 can control in-rush current withrespect to the telemetry circuit when the telemetry circuit isdisconnected from the power source. For instance, the power managementcircuit of the implantable device 104 can control in-rush current withrespect to voltage-voltage converter of the telemetry circuit. The powersource can include one or more power supplies. In one example, the powersource can be a battery that supplies power to the telemetry circuitand/or one or more other circuits of the implantable device 104. In anaspect, the power management circuit can employ the switch to disconnectthe telemetry circuit from the power source via a set ofcurrent-limiting devices in response to a determination that theimplantable device 104 (e.g., the telemetry circuit of the implantabledevice) is not communicating with the external device 116 and/or is notbroadcasting an advertising data packet. For example, the powermanagement circuit can perform a soft stop process where a firstcurrent-limiting device is disconnected from the telemetry circuit inresponse to a determination that telemetry circuit is to be disconnectedfrom the power source, and a second current-limiting device isdisconnected from the telemetry circuit in response to a determinationthat the first current-limiting device is disconnected from thetelemetry circuit for a defined period of time.

The power management circuit of the implantable device 104 can also beemployed to mitigate start up synchronization with respect to the powersource and the telemetry circuit. Furthermore, the power managementcircuit of the implantable device 104 can control in-rush current withrespect to the telemetry circuit when the telemetry circuit is connectedto the power source. For instance, the power management circuit of theimplantable device 104 can control in-rush current with respect tovoltage-voltage converter of the telemetry circuit when the telemetrycircuit is connected to the power source. In another aspect, the powermanagement circuit can employ the switch to connect the telemetrycircuit to the power source via a set of current-limiting devices inresponse to a determination that the implantable device 104 (e.g., thetelemetry circuit of the implantable device) is beginning acommunication process to communicate with respect to the external device116 and/or broadcast an advertising data packet. For example, the powermanagement circuit can perform a soft start process where the powersource is connected to the telemetry circuit via a firstcurrent-limiting device in response to a determination that telemetrycircuit is to be connected to the power source, and the telemetrycircuit is connected to a second current-limiting device in response toa determination that the telemetry circuit is connected to the firstcurrent-limiting device for a defined period of time. The powermanagement circuit can also provide improved system startup timing bymanaging power provided to the telemetry circuit. In certainembodiments, the power management circuit can also facilitate reducedfrequency and/or reduced duration of recharge for the power source ofthe implantable device 104.

In an embodiment, the power management circuit of the implantable device104 can monitor a power supply condition of the power source that isprovided to the telemetry circuit when the telemetry is powered on. Forinstance, the power management circuit of the implantable device 104 canrepeatedly monitor (e.g., continually monitor) a power supply conditionof the power source that is provided to the telemetry circuit to enableswitching off of the telemetry circuit in response to a determinationthat the power supply condition satisfies a defined criterion. In oneexample, the power management circuit of the implantable device 104 canrepeatedly monitor (e.g., continually monitor) a power supply conditionof the power source that is provided to the telemetry circuit to enableswitching off of the telemetry circuit in response to a determinationthe power supply condition corresponds to a low voltage condition.Alternatively, the power management circuit of the implantable device104 can repeatedly monitor (e.g., continually monitor) a power supplycondition of the power source that is provided to the telemetry circuitto enable switching off of the telemetry circuit in response to adetermination the power supply condition corresponds to a high voltagecondition. In another example, the power management circuit of theimplantable device 104 can repeatedly monitor (e.g., continuallymonitor) a power supply condition of the power source that is providedto the telemetry circuit to enable switching off of the telemetrycircuit in response to a determination the power supply conditioncorresponds to a low current condition. Alternatively, the powermanagement circuit of the implantable device 104 can repeatedly monitor(e.g., continually monitor) a power supply condition of the power sourcethat is provided to the telemetry circuit to enable switching off of thetelemetry circuit in response to a determination the power supplycondition corresponds to a high current condition.

The telemetry circuit of the implantable device 104 can include at leastone antenna to facilitate communication with other devices (e.g., theexternal device 116). In an embodiment, the telemetry circuit of theimplantable device 104 can be configured to generate and/or broadcast anadvertising data packet. An advertising data packet generated and/orbroadcasted by the telemetry circuit of the implantable device 104 canbe a data packet employed for advertising information to other devices(e.g., the external device 116). For example, the implantable device 104can broadcast certain data to share with other devices (e.g., theexternal device 116) via an advertising data packet. In someembodiments, an advertising data packet can be a bit stream that isgrouped into a set of code words. Additionally, an advertising packetcan include one or more types or sections of data that includeinformation for other devices in close proximity to the implantabledevice 104 that broadcasts the advertising data packet. For instance, anadvertising data packet can include data associated with the implantabledevice 104. In an aspect, an advertising data packet can facilitate aconnection between the implantable device 104 and the external device116 that receives the advertising data packet. In certain embodiments,the advertising data packet can include a header portion and a dataportion that can be read by other devices (e.g., the external device116) to determine whether the other devices should connect to theimplantable device 104. For example, the other devices (e.g., theexternal device 116) can establish a connection with the implantabledevice 104 in response to a determination that the header portionincludes information relevant to the other devices (e.g., the externaldevice 116). However, the other devices (e.g., the external device 116)can withhold from establishing a connection with the implantable device104 in response to a determination that the header portion does notinclude information relevant to the other devices (e.g., the externaldevice 116). In one example, the implantable device 104 can beimplemented as an advertiser device and the external device 116 can beimplemented as a scanner device.

The implantable device 104 can also include one or more devices,transducers and/or circuits that can convert information from one formatto another format. In some embodiments, the implantable device 104 caninclude a device, a transducer and/or a circuit that can convert asignal associated with particular data for the implantable device 104(or, in embodiments in which the implantable device 104 is an IMD,alternatively or additionally, the status of the IMD) to information fortransmission by the implantable device 104 (or generally to anothersignal of any number of different formats suitable for reception by theexternal device 116).

The external device 116 can scan for the advertising data packetassociated with the telemetry circuit of the implantable device 104(e.g., without connecting to the implantable device 104). For example,the external device 116 can include a receiver that can monitor for theadvertising data packet generated by the telemetry circuit of theimplantable device 104. As such, if the external device 116 is within acertain range from the implantable device 104 and detects theadvertising data packet, the external device 116 can obtain the dataassociated with the implantable device 104 without connecting to theimplantable device 104.

In some embodiments, the external device 116 can establish acommunication link with the implantable device 104 based on theadvertising data packet. For instance, the advertising data packet caninclude information indicative of a request to establish thecommunication link with the implantable device 104. In one example, theadvertising data packet can include an identifier for a particularcommunication channel. In another example, the advertising data packetcan include an identifier for network device associated with aparticular communication channel.

After establishment of the communication link between the implantabledevice 104 and the external device 116, in some embodiments, theexternal device 116 and the implantable device 104 can exchange one ormore data packets. For example, after a communication link isestablished between the external device 116 and the implantable device104 (e.g., based on detection by the external device 116 of anadvertising data packet that includes data associated with theimplantable device 104), the external device 116 can communicate withthe implantable device 104 to exchange data with the implantable device104. In a non-limiting example, the external device 116 can read datacaptured by the implantable device 104 (e.g., electrogram data, etc.)during the communication. The implantable device 104 can also transmitsensed physiological data, diagnostic determinations made based on thesensed physiological data, implantable device 104 performance dataand/or implantable device 104 integrity data to the external device 116.

By employing the power management circuit of the implantable device 104,performance of the power source included in the implantable device 104can be improved. For instance, power of the power source can beconserved and/or longevity of the power source can be improved byemploying the power management circuit of the implantable device 104.Furthermore, the power source and/or the implantable device 104 canoperate more efficiently by reducing unnecessary processing by thetelemetry circuit of the implantable.

Data associated with the implantable device 104 can also be provided toa wide variety of external devices, including, but not limited to, atablet computer associated with a patient or a physician, a smart phoneassociated with a patient or a physician, a medical device associatedwith a patient or a physician, an electronic device at a home of apatient or at an office of a physician, an off-the-shelf devicepurchased at a store, etc. Additionally, in some embodiments,compatibility between the implantable device 104 and external devicescan be increased by allowing the data associated with the implantabledevice 104 to be included in an advertising data packet that can bereceived by any external device through the utilization of acommunication protocol, such as, but not limited to, the BLUETOOTH® lowenergy communication protocol.

In the example shown in implantable device telemetry system 100, aperson operating the external device 116 can be a patient in which theimplantable device 104 is implanted. In another example, another person(e.g., such as medical caregiver) interacting with the patient in whichthe implantable device 104 is implanted can operate the external device116 outside the body 102 in which the implantable device 104 is located.In various embodiments, the implantable device 104 can include anynumber of different types of medical devices configured to communicatewith the external device 116 or another external device. The particular,size, shape, placement and/or function of the implantable device 104 maynot be critical to the subject disclosure in some embodiments.

In one embodiment, as mentioned, the implantable device 104 is orincludes an IMD. For example, some example IMDs can include, but are notlimited to, cardiac pacemakers, cardiac defibrillators, cardiacre-synchronization devices, cardiac monitoring devices, cardiac pressuremonitoring devices, spinal stimulation devices, neural stimulationdevices, gastric stimulation devices, diabetes pumps, drug deliverydevices, and/or any other medical devices. In various embodiments,however, the implantable device 104 can be or include any number ofother types of implantable devices that are not IMDs.

For exemplary purposes, the implantable device 104 is illustrated inimplantable device telemetry system 100 as an IMD implanted within thechest of a patient and configured to provide medical treatmentassociated with a heart disease or condition (e.g., an implantablecardioverter-defibrillator (ICD) and/or a pacemaker). In addition to themedical treatment, the implantable device 104 can also be configured toprovide the data packetizing and communication operations describedherein. The implantable device 104 includes a housing 106 within whichelectrical components and one or more power sources are housed. Theelectrical components can be powered via the one or more power sources.A power source (e.g., power source 206 shown in connection with FIGS. 2,3, 4 and 5) can include, but is not limited to, a battery, a capacitor,a charge pump, a mechanically derived power source (e.g.,microelectromechanical systems (MEMs) device), or an inductioncomponent. The various embodiments described herein can provide improvedmanagement of power associated with the one or more power sources.

The electrical components can vary depending on the particular featuresand functionality of the implantable device 104. In various embodiments,these electrical components can include, but are not limited to, one ormore processors, memories, transmitters, receivers, transceivers,sensors, sensing circuitry, therapy circuitry, antennas and othercomponents. In an embodiment, the electrical components can be formed onor within a substrate that is placed inside the housing 106. The housing106 can be formed from conductive materials, non-conductive materials ora combination thereof. For example, housing 106 can include a conductivematerial, such as metal or metal alloy, a non-conductive material suchas glass, plastic, ceramic, etc., or a combination of conductive andnon-conductive materials. In some embodiments, the housing 106 can be abiocompatible housing (e.g., a liquid crystal polymer, etc.).

In the embodiment shown, the implantable device 104 is also an IMD andfurther includes leads 110 a,b connected to the housing 106. The leads110 a,b extend into the heart and respectively include one or moreelectrodes. For example, as depicted in implantable device telemetrysystem 100, leads 110 a,b each include a respective tip electrodes 112a,b and ring electrodes 114 a,b located near a distal end of theirrespective leads 110 a,b. When implanted, tip electrodes 112 a,b and/orring electrodes 114 a,b are placed relative to or in a selected tissue,muscle, nerve or other location within the body 102 of the patient. Asdepicted in implantable device telemetry system 100, tip electrodes 112a,b are extendable helically shaped electrodes to facilitate fixation ofthe distal end of leads 110 a,b to the target location within the body102 of the patient. In this manner, tip electrodes 112 a,b are formed todefine a fixation mechanism. In other embodiments, one or both of tipelectrodes 112 a,b may be formed to define fixation mechanisms of otherstructures. In other instances, leads 110 a,b may include a fixationmechanism separate from tip electrodes 112 a,b. Fixation mechanisms canbe any appropriate type, including a grapple mechanism, a helical orscrew mechanism, a drug-coated connection mechanism in which the drugserves to reduce infection and/or swelling of the tissue, or otherattachment mechanism.

Leads 110 a,b are connected at a proximal end of the implantable device104 via connector block 108. Connector block 108 may include one or morereceptacles that interconnect with one or more connector terminalslocated on the proximal end of leads 110 a,b. Leads 110 a,b areultimately electrically connected to one or more of the electricalcomponents within housing 106. One or more conductors (not shown) extendwithin leads 110 a,b from connector block 108 along the length of thelead to engage the ring electrodes 114 a,b and tip electrodes 112 a,b,respectively. In this manner, each of tip electrodes 112 a,b and ringelectrodes 114 a,b is electrically coupled to a respective conductorwithin its associated lead bodies. For example, a first electricalconductor can extend along the length of the body of lead 110 a fromconnector block 108 and electrically couple to tip electrode 112 a and asecond electrical conductor can extend along the length of the body oflead 110 a from connector block 108 and electrically couple to ringelectrode 114 a. The respective conductors may electrically couple tocircuitry, such as a therapy module or a sensing module, of theimplantable device 104 via connections in connector block 108.

In one or more embodiments, the implantable device 104 is configured todeliver therapy to the heart (or other location) via the electricalconductors to one or more of electrodes 112 a,b and 114 a,b. In the caseof pacing therapy, for example, the implantable device 104 may deliverpacing pulses via a unipolar electrode configuration, e.g., usingelectrodes 112 a,b and a housing electrode of the implantable device104. In other instances, the implantable device 104 may deliver pacingpulses via a bipolar electrode configuration, e.g., using electrodes 112a,b and ring electrodes 114 a,b. Implantable device 104 may also receivesensed electrical signals on the electrical conductors from one or moreof electrodes 112 a,b and 114 a,b. The implantable device 104 may sensethe electrical signals using either a unipolar or bipolar electrodeconfiguration.

The configuration, features and functionality of implantable device 104are merely provided as an example. In other examples, the implantabledevice 104 can include more or fewer leads extending from the housing106. For example, the implantable device 104 can be coupled to threeleads, e.g., a third lead implanted within a left ventricle of the heartof the patient. In another example, the implantable device 104 can becoupled to a single lead that is implanted within the ventricle of theheart of the patient. In other embodiments, the lead may be anextravascular lead with the electrodes implanted subcutaneously abovethe ribcage/sternum or underneath or below the sternum. Exampleextravascular ICDs having subcutaneous electrodes are described in U.S.Patent Publication No. 2014/0214104 (Greenhut et al.) and U.S. PatentPublication No. 2015/0133951 (Seifert et al.), each of which isincorporated herein in its entirety. One example extravascular ICDhaving substernal electrodes is described in U.S. Patent Publication No.2014/0330327 (Thompson-Nauman et al.). In some embodiments, theimplantable device 104 can include other leads (e.g., atrial lead and/orleft ventricular lead). As such, implantable device 104 can be used forsingle chamber or multi-chamber cardiac rhythm management therapy. Inaddition to more or fewer leads, each of the leads may include more orfewer electrodes. In instances in which the implantable device 104 isused for therapy other than pacing, (e.g., defibrillation orcardioversion), the leads can include elongated electrodes, which may,in some instances, take the form of a coil. The implantable device 104can deliver defibrillation or cardioversion shocks to the heart via anycombination of the elongated electrodes and housing electrode. Asanother example, the implantable device 104 can include leads with aplurality of ring electrodes, (e.g., as used in some implantableneurostimulators), without a tip electrode or with one of the ringelectrodes functioning as the “tip electrode.”

In another embodiment, the implantable device 104 may include no leads,as in the case of an intracardiac pacemaker or a leadless pressuresensor. In the case of an intracardiac pacemaker, the device may includea housing sized to fit wholly within the patient's heart. In oneexample, the housing may have a volume that is less than 1.5 cc and,more preferably, less than 1.0 cubic centimeter (cc). However, thehousing may be greater than or equal to 1.5 cc in other examples. Theintracardiac pacemaker includes at least two electrodes spaced apartalong the outer portion of the housing for sensing cardiac electrogramsignals and/or delivering pacing pulses. Example intracardiac pacemakersare described in commonly-assigned U.S. Patent Publication No.2012/0172690 (Anderson et al.), U.S. Patent Publication No. 2012/0172941(Kenneth), and U.S. Patent Publication No. 2014/0214104 (Greenhut etal.), each of which is incorporated herein in its entirety. In the caseof a leadless pressure sensor, the device may include a housing having afixation member and a pressure sensing component. One example of aleadless pressure sensor is described in U.S. Patent Publication No.2012/0108922 (Schell et al.), which is incorporated herein in itsentirety.

External device 116 can include any suitable computing device configuredto communicate with implantable device 104. In some embodiments, theexternal device 116 can be a remote electronic device. For example,external device 116 can include, but is not limited to, a handheldcomputing device, a mobile phone, a smart phone, a tablet personalcomputer (PC), a laptop computer, a desktop computer, a personal digitalassistant (PDA) and/or a wearable device. In some embodiments, theexternal device 116 can include a display that can present dataassociated with the implantable device 104. In another embodiment, theexternal device 116 can include an application and/or a programassociated with the implantable device 104.

FIG. 2 illustrates a block diagram of an example, non-limiting medicaldevice (e.g., implantable device 104) in accordance with one or moreembodiments described herein. The implantable device 104 includes atelemetry circuit 202, a power management circuit 204, a power source206 and/or other implantable device circuitry/hardware 208. Thetelemetry circuit 202 can be a hardware circuit and/or can include oneor more hardware electronic components. The power management circuit 204can also be a hardware circuit and/or can include one or more hardwareelectronic components. In certain embodiments, aspects of the telemetrycircuit 202, the power management circuit 204 and/or the otherimplantable device circuitry/hardware 208 can constitutemachine-executable component(s) embodied within machine(s), e.g.,embodied in one or more computer readable mediums (or media) associatedwith one or more machines. Such component(s), when executed by the oneor more machines, e.g., computer(s), computing device(s), virtualmachine(s), etc. can cause the machine(s) to perform the operationsdescribed. Implantable device 104 can include a memory 210 for storingcomputer executable components and instructions. Implantable device 104can further include a processor 212 to facilitate operation of theinstructions (e.g., computer executable components and instructions) byimplantable device 104. Implantable device 104 can also include a bus214 that couples the various components of the implantable device 104,including, but not limited to, the telemetry circuit 202, the powermanagement circuit 204, the power source 206, the other implantabledevice circuitry/hardware 208, the memory 210 and/or the processor 212.In an embodiment, the telemetry circuit 202 can be coupled to the bus214 and the power management circuit 204. Furthermore, the powermanagement circuit 204 can be implemented between the telemetry circuit202 and the power source 206. For example, the power management circuit204 can be coupled to the telemetry circuit 202 and the power source206. As such, the telemetry circuit 202 can receive power from the powersource 206 via the power management circuit 204. Repetitive descriptionof like elements employed in other embodiments described herein isomitted for sake of brevity.

The telemetry circuit 202 can facilitate a telemetry session between theimplantable device 104 and the external device 116. The telemetrycircuit 202 can additionally or alternatively facilitate reception ofdata packets by the implantable device 104. The power management circuit204 can be employed to facilitate a reduction in power employed by thetelemetry circuit 202 and/or to extend a lifespan of the power source206. For instance, the power management circuit 204 can employ asoft-start sequence associated with current-limiting devices of thepower management circuit 204 to control current provided to thetelemetry circuit 202 while also satisfying startup timing for atelemetry session executed by the telemetry circuit 202. In anembodiment, the power management circuit 204 can connect the powersource 206 to the telemetry circuit 202 via a first current-limitingdevice of the power management circuit 204 based on a determination thatthe telemetry circuit 202 satisfies a defined criterion. In one example,the power management circuit 204 can connect the power source 206 to thetelemetry circuit 202 via a first current-limiting device of the powermanagement circuit 204 (e.g., first current-limiting device 304 shown inFIGS. 3, 4 and 5) in response to a determination that the telemetrycircuit 202 is beginning a telemetry session with the external device116. For instance, the power management circuit 204 and/or the processor212 can determine that the telemetry circuit 202 is beginning atelemetry session with the external device 116. In one embodiment, thepower management circuit 204 and/or the processor 212 can employ aschedule to determine that the telemetry circuit 202 is beginning atelemetry session with the external device 116. In another embodiment,the power management circuit 204 and/or the processor 212 can employinformation generated and/or provided by the other implantable devicecircuitry/hardware 208 to determine that the telemetry circuit 202 isbeginning a telemetry session with the external device 116. Furthermore,the power management circuit 204 can connect the telemetry circuit 202to a second current-limiting device of the power management circuit 204based on a determination that the telemetry circuit 202 is connected tothe first current-limiting device for a defined period of time. In analternate embodiment, the power management circuit 204 can connect thetelemetry circuit 202 to a second current-limiting device of the powermanagement circuit 204 (e.g., second current-limiting device 305 shownin FIGS. 3, 4 and 5) based on a determination that a voltage levelassociated with the telemetry circuit 202 and/or a current levelassociated with the telemetry circuit 202 satisfies a defined thresholdvalue. It is to be appreciated that, in certain embodiments, the powermanagement circuit 204 can employ more than two current-limiting devicesand/or more than one switch to facilitate improved power management ofthe implantable device 104 and/or the power source 206.

In certain embodiments, the telemetry circuit 202 can include atransmitter/receiver (e.g., a transceiver). The telemetry circuit 202can be configured to generate and/or broadcast an advertising datapacket associated with the implantable device 104. In an embodiment, thetelemetry circuit 202 can broadcast an advertising data packet for theimplantable device 104 at a defined beaconing rate. In an aspect, thetelemetry circuit 202 can include a packet generator, a transmitter, afrequency modulator, and/or other circuitry configured to generate theadvertising data packet at the defined beaconing rate. The advertisingdata packet can be configured for transmission over an advertisingcommunication channel. In some embodiments, the advertisingcommunication channel can be a communication channel that is associatedwith a particular frequency employed for broadcast of information. Invarious embodiments, the advertising communication channel describedherein can be a 2402 megahertz (MHz) communication channel, a 2426 MHzcommunication channel and/or a 2480 MHz communication channel. Theparticular frequencies provided are mere examples and, in otherembodiments, the advertising communication channel can be located at anynumber of other different frequencies. The type of transmitter/receiveremployed by the telemetry circuit 202 can vary depending on the type oftelemetry protocol the implantable device 104 is configured to employ.In some embodiments, the telemetry circuit 202 can be configured toperform different types of telemetry protocols. In other embodiments,the telemetry circuit 202 can include a plurality of differenttransmitters/receivers that are respectively configured to performdifferent types of telemetry communication protocols. In someembodiments, rather than including a transmitter and a receiver that donot share common circuitry, the telemetry circuit 202 can include atransceiver.

Additionally, the telemetry circuit 202 can wirelessly transmit theadvertising data packet associated with the implantable device 104. Forinstance, the telemetry circuit 202 can wirelessly transmit from thebody 102 the advertising data packet associated with the implantabledevice 104. In one example, the telemetry circuit 202 can transmit theadvertising data packet during a defined period of time. In anotherexample, the telemetry circuit 202 can transmit the advertising datapacket one or more times during a defined period of time to advertisethe advertising data packet to an external device (e.g., the externaldevice 116). In some embodiments, the telemetry circuit 202 cansequentially transmit the advertising data packet associated with theimplantable device 104 via two or more advertising communicationchannels. For example, the telemetry circuit 202 can sequentiallytransmit the advertising data packet via a first advertisingcommunication channel (e.g., a 2402 MHz communication channel), a secondadvertising communication channel (e.g., a 2426 MHz communicationchannel) and/or a third advertising communication channel (e.g., a 2480MHz communication channel). In another example, the telemetry circuit202 can concurrently transmit the advertising data packet associatedwith the implantable device 104 via two or more of the advertisingcommunication channels. For example, the telemetry circuit 202 canconcurrently transmit the advertising data packet that includes the dataassociated with the implantable device 104 via a first advertisingcommunication channel (e.g., a 2402 MHz communication channel), a secondadvertising communication channel (e.g., a 2426 MHz communicationchannel) and/or a third advertising communication channel (e.g., a 2480MHz communication channel).

The telemetry circuit 202 can transmit the advertising data packet viaan advertising communication channel associated with a communicationprotocol utilizing lower energy consumption than a conventionalcommunication protocol for wirelessly transmitting data. In anon-limiting example, the telemetry circuit 202 can transmit theadvertising data packet via an advertising communication channelassociated with a BLUETOOTH® low energy (BLE) protocol. The telemetrycircuit 202 can additionally or alternatively establish, via acommunication channel that different than the advertising communicationchannel associated with the advertising data packet, a wirelesscommunication link with the external device 116. In one embodiment, theimplantable device 104 can connect to (e.g., actively communicate with)the external device 116, transmit data directly to the external device116 and/or receive data from the external device 116 via the wirelesscommunication link. For example, the external device 116 can read datacaptured by the implantable device 104 (e.g., electrogram data) via thewireless communication link. In another example, the implantable device104 can transmit sensed physiological data, diagnostic determinationsmade based on the sensed physiological data, implantable device 104performance data and/or implantable device 104 integrity data toexternal device 116 via the wireless communication link.

The telemetry circuit 202 can be powered by the power source 206 tofacilitate generation and/or broadcasting of the advertising datapacket. The telemetry circuit 202 can receive the power associated withthe power source 206 via the power management circuit 204. For instancethe power management circuit 204 can manage the power provided to thetelemetry circuit 202. In an aspect, the power source 206 can be, forexample, a fixed power source within the implantable device 104. Thepower source 206 can provide power to at least the telemetry circuit202. In an embodiment, the power source 206 can be a battery thatsupplies power to the telemetry circuit 202 via the power managementcircuit 204. However, it is to be appreciated that the power source 206can be a different type of power source such as, for example, acapacitor, a charge pump, a mechanically derived power source (e.g., aMEMs device), an induction component, or another type of power source.

In certain embodiments, the power management circuit 204 can monitor(e.g., continually monitor) power provided to the telemetry circuit 202.For instance, the power management circuit 204 can repeatedly monitor apower supply condition associated with the telemetry circuit based on aninitiation of a connection between the telemetry circuit 202 and thepower source 206 via the power management circuit 204 (e.g., via thesecond current-limiting device of the power management circuit 204). Inan embodiment, the power management circuit 204 can disconnect thetelemetry circuit 202 from the power source 206 in response to adetermination that a power supply condition associated with thetelemetry circuit 202 satisfies a defined criterion. The power supplycondition can include, for example, a voltage level associated with thetelemetry circuit 202, a current level associated with the telemetrycircuit 202, and/or another electrical parameter associated with thetelemetry circuit 202. In one example, the power management circuit 204can disconnect the telemetry circuit 202 from the secondcurrent-limiting device of the power management circuit 204 based on adetermination that a power supply condition associated with thetelemetry circuit 202 satisfies a defined voltage level. The powermanagement circuit 204 can also alter a duty cycle of the power source206 in response to a determination that the power supply conditionsatisfies a defined power supply level. For instance, the powermanagement circuit 204 can reduce a duty cycle of the power source 206in response to a determination that the power supply condition satisfiesa defined power supply level. In one example, the power managementcircuit 204 can also alter a duty cycle of the power source 206 based ona determination that a voltage level associated with the telemetrycircuit 202 satisfies a defined voltage level.

In another embodiment, the power management circuit 204 can disconnectthe telemetry circuit 202 from the power source 206 in response to adetermination that the telemetry circuit 202 has failed to communicatewith the external device 116 or another device. For instance, the powermanagement circuit 204 can disconnect the telemetry circuit 202 from thepower source 206 in response to a determination that the telemetrycircuit 202 is not broadcasting an advertising data packet and/or is notcommunicating with the external device 116. In one embodiment, the powermanagement circuit 204 can determine whether the telemetry circuit 202is broadcasting an advertising data packet and/or is communicating withthe external device 116 based on a voltage level associated with thetelemetry circuit 202. For example, the power management circuit 204 candetermine that the telemetry circuit 202 is not broadcasting anadvertising data packet and/or is not communicating with the externaldevice 116 based on a determination that a voltage reading associatedwith the telemetry circuit 202 is below a defined threshold value. Inanother embodiment, the power management circuit 204 can disconnect thetelemetry circuit 202 from the power source 206 by disconnecting thesecond current-limiting device of the power management circuit 204 fromthe telemetry circuit 202. In certain embodiments, after disconnectingthe telemetry circuit 202 from the power source 206 for a defined periodof time, the power management circuit 204 can connect the power source206 to the telemetry circuit 202 via the first current-limiting deviceof the power management circuit 204, and then the power managementcircuit 204 can connect the telemetry circuit 202 to the secondcurrent-limiting device of the power management circuit 204 based on adetermination that the telemetry circuit 202 is connected to the firstcurrent-limiting device for a defined period of time.

With reference to FIGS. 1 and 2, in some embodiments, the telemetrycircuit 202 can communicate with the other implantable devicecircuitry/hardware 208. The other implantable device circuitry/hardware208 can include, for example, therapy delivery circuitry, electricalsensing circuitry and/or other circuitry for medical treatment purposesassociated with the implantable device 104. In an embodiment, the otherimplantable device circuitry/hardware 208 can be configured to sensecardiac electrical activity, detect cardiac rhythms, and/or generateelectrical stimulation therapies based on sensed signals. The otherimplantable device circuitry/hardware 208 can be, for example,electrically coupled to tip electrodes 112 a,b, ring electrodes 114 a,band/or the housing 106 to deliver electrical stimulation therapies suchas cardioversion-defibrillation (CV/DF) shocks. In some examples, theother implantable device circuitry/hardware 208 can be additionallycoupled to tip electrodes 112 a,b and/or ring electrodes 114 a,b for usein delivering therapy and/or delivering mild electrical stimulation togenerate a patient alert.

The other implantable device circuitry/hardware 208 can be electricallycoupled to tip electrodes 112 a,b and ring electrodes 114 a,b carried byleads 110 a,b and housing 106, which may serve as a common or groundelectrode. The other implantable device circuitry/hardware 208 can beselectively coupled to tip electrodes 112 a,b, ring electrodes 114 a,band/or the housing 106 in order to, for example, monitor electricalactivity of the patient's heart (e.g., electrical activity associatedwith tip electrodes 112 a,b and/or ring electrodes 114 a,b). Forexample, the other implantable device circuitry/hardware 208 can includedetection circuitry associated with tip electrodes 112 a,b and/or ringelectrodes 114 a,b. In one embodiment, the other implantable devicecircuitry/hardware 208 can be enabled to monitor one or more sensingvectors selected from the tip electrodes 112 a,b and/or the ringelectrodes 114 a,b. For example, the other implantable devicecircuitry/hardware 208 can include switching circuitry for selectingwhich of tip electrodes 112 a,b, ring electrodes 114 a,b and housing 106are coupled to sense amplifiers or other cardiac event detectorsincluded in the other implantable device circuitry/hardware 208.Switching circuitry can include, for example, a switch array, a switchmatrix, a multiplexer, or any other type of switching device suitable toselectively couple sense amplifiers to selected electrodes.

In some examples, the other implantable device circuitry/hardware 208can include multiple sensing channels for sensing multipleelectrocardiogram (ECG) sensing vectors selected from tip electrodes 112a,b, ring electrodes 114 a,b and/or the housing 106. For example, theother implantable device circuitry/hardware 208 can include two sensingchannels. Each sensing channel can include a sense amplifier or othercardiac event detection circuitry for sensing cardiac events, e.g.,R-waves, from the received ECG signal developed across selectedelectrodes (e.g., tip electrodes 112 a,b and/or ring electrodes 114a,b). The cardiac event detector can operate using an auto-adjustingsensing threshold set based on a peak amplitude of a currently sensedevent that can decay over time. Each time the received ECG signalcrosses the auto-adjusting sensing threshold outside an absoluteblanking period, a cardiac sensed event signal, such as an R-wave sensedevent signal, can be produced and used for detecting ventriculartachycardia (VT).

The other implantable device circuitry/hardware 208 also can beconfigured, for example, to detect VT episodes that may belife-threatening if left untreated (generally referred to herein as a“shockable rhythm”) such as, for example, non-sinus VT, ventricularfibrillation, etc. The timing of R-wave sensed event signals receivedfrom the other implantable device circuitry/hardware 208 can be used todetermine R wave to R wave intervals between cardiac sensed eventsignals. The other implantable device circuitry/hardware 208 can, forexample, count RR intervals that fall into different rate detectionzones for determining a ventricular rate or performing other rate-basedassessments or interval-based assessments for detecting VT anddiscriminating VT from rhythms that do not require a CV/DF shock.

The other implantable device circuitry/hardware 208 can additionally oralternatively include an analog-to-digital converter that provides adigital ECG signal from one or all available sensing channels forfurther signal analysis for use in VT detection. A sensed ECG signal canbe converted to a multi-bit digital signal by the other implantabledevice circuitry/hardware 208 and employed by the other implantabledevice circuitry/hardware 208 for performing ECG morphology analysis.Analysis of the ECG signal morphology can be performed for detecting,confirming or discriminating VT.

In an embodiment, the other implantable device circuitry/hardware 208can include a high voltage (HV) therapy delivery circuitry including oneor more HV output capacitors and, in some instances, a low voltagetherapy delivery circuit. When a shockable VT rhythm is detected, the HVoutput capacitors can be charged to a predefined voltage level by a HVcharging circuit. The other implantable device circuitry/hardware 208can, for example apply a signal to trigger discharge of the HVcapacitors upon detecting a feedback signal indicating that the HVcapacitors have reached the voltage required to deliver a programmedshock energy. In this way, the other implantable devicecircuitry/hardware 208 can control operation of the high voltage outputcircuit of the other implantable device circuitry/hardware 208 todeliver high energy cardioversion/defibrillation shocks using tipelectrodes 112 a,b, ring electrodes 114 a,b and/or the housing 106.

Each sensing channel included in the other implantable devicecircuitry/hardware 208 can include spike detector circuitry fordetecting non-physiological electrical signal spikes present in thecardiac electrical(s) received by the other implantable devicecircuitry/hardware 208. The spike detector can produce a spike detectsignal for use in detecting a lead issue as well as avoiding falsedetections of VT due to oversensing of electrical spikes that are nottrue R-waves. In some examples, the other implantable devicecircuitry/hardware 208 can be configured to detect pacing pulsesdelivered to the body 102. For example, bradycardia pacing pulses oranti-tachycardia pacing pulses delivered by the implantable device 104may be detected by the spike detector of the other implantable devicecircuitry/hardware 208.

In certain embodiments, the external device 116 can employ telemetrycommunication to communicate with the telemetry circuit 202 of theimplantable device 104. For example, the external device 116 can performtelemetry communication with the telemetry circuit 202 of theimplantable device 104 using a telemetry communication protocol. In anembodiment, the external device 116 can scan for an advertising datapacket associated with the implantable device 104 via at least oneadvertising communication channel. For example, the external device 116can passively scan an advertising data packet associated with thetelemetry circuit 202 of implantable device 104 without transmittingdata to the implantable device 104. In various embodiments, the externaldevice 116 can scan a first advertising communication channel (e.g., a2402 MHz communication channel), a second advertising communicationchannel (e.g., a 2426 MHz communication channel) and/or a thirdadvertising communication channel (e.g., a 2480 MHz communicationchannel) for an advertising data packet associated with a medical device(e.g., implantable device 104). In embodiments in which two or morechannels are scanned, the particular advertising channels can be scannedin any order.

The external device 116 can also establish a communication link with thetelemetry circuit 202 of the implantable device 104 via a communicationchannel that is different than the advertising communication channelbased on a determination that a criterion associated with an identifiedadvertising data packet is satisfied. A criterion associated with anidentified advertising data packet can be, for example, that theidentified advertising data packet is intended for and/or can beprocessed by the external device 116. For example, a criterionassociated with an identified advertising data packet can be related tomedical data associated with the implantable device 104.

FIG. 3 illustrates an example, non-limiting system 300 in accordancewith one or more embodiments described herein. The system 300 includesthe telemetry circuit 202, the power management circuit 204, the powersource 206 and the other implantable device circuitry/hardware 208. Forexample, the system 300 can correspond to the telemetry circuit 202, thepower management circuit 204 and the power source 206 in connection withthe implantable device 104 shown in FIG. 2. Repetitive description oflike elements employed in other embodiments described herein is omittedfor sake of brevity.

Power source consumption of the telemetry circuit 202 can be reduced byemploying the power management circuit 204. Furthermore, the powermanagement circuit 204 can provide improved longevity of the powersource 206 and/or the implantable device 104. In certain embodiments,the power management circuit 204 can also facilitate reduced frequencyand/or reduced duration of recharge for the power source 206 inembodiments where the implantable device 104 is a rechargeableimplantable device. The power management circuit 204 can include acontroller 302, a soft-start sequence device 303 that includes a firstcurrent-limiting device 304 and a second current-limiting device 305,and a third current-limiting device 306. The power source 206 can beelectrically coupled to the soft-start sequence device 303 (e.g., thefirst current-limiting device 304 and the second current-limiting device305) via an electrical node 310. Furthermore, the soft-start sequencedevice 303 (e.g., the first current-limiting device 304 and the secondcurrent-limiting device 305) can be electrically coupled to thetelemetry circuit 202 via an electrical node 312. The soft-startsequence device 303 (e.g., the first current-limiting device 304 and thesecond current-limiting device 305) can also be electrically coupled toa capacitor device 314 via the electrical node 312. The thirdcurrent-limiting device 306 can be electrically coupled to the otherimplantable device circuitry/hardware 208 via an electrical node 316.The third current-limiting device 306 can also be electrically coupledto a capacitor device 318 via the electrical node 316. In an aspect, thecapacitor device 314 can be employed as a decoupling capacitor todecouple at least a portion of the telemetry circuit 202 connected tothe power source 206. Furthermore, the capacitor device 318 can beemployed as a decoupling capacitor to decouple at least a portion of theother implantable device circuitry/hardware 208 connected to the powersource 206.

Impedance of the first current-limiting device 304 can be an impedancevalue that is low enough to pre-charge the telemetry circuit 202impedance such that a secondary current impulse associated with a brownout condition can be avoided when the second current-limiting device 305is switched on. For instance, a resistance value of the firstcurrent-limiting device 304 can be approximately 1000 times greater thanthe second current-limiting device 305. As used herein, a “brown outcondition” can be an unintended drop in voltage that can affectperformance and/or a condition of the implantable device 104 and/or thetelemetry circuit 202 of the implantable device 104. In a non-limitingexample, the first current-limiting device 304 can comprise a resistanceequal to 1kΩ and the second current-limiting device 305 can comprise aresistance equal to 5Ω. However, it is to be appreciated that the firstcurrent-limiting device 304 and/or the second current-limiting device305 can comprise a different resistance. In another non-limitingexample, the first current-limiting device 304 can be a first resistorand the second current-limiting device 305 can be a second resistor. Inyet another non-limiting example, the first current-limiting device 304can be a first constant current source and the second current-limitingdevice 305 can be a second constant current source. For instance, avalue of a first constant current source associated with the firstcurrent-limiting device 304 and/or a value of a second constant currentsource associated with the second current-limiting device 305 can beassociated with a current value that prevents a voltage droop condition(e.g., a brown out condition) associated with the telemetry circuit 202.Furthermore, the first current-limiting device 304 and/or the secondcurrent-limiting device 305 can be programmable (e.g., programmable by auser). For instance, an amount of current provided by the firstcurrent-limiting device 304 and/or the second current-limiting device305 can be programmable. Additionally or alternatively, the firstcurrent-limiting device 304 and/or the second current-limiting device305 can be configured based on a hardware circuit of the implantabledevice 104 and/or firmware stored by the implantable device 104, wherecurrent restriction of the first current-limiting device 304 and/or thesecond current-limiting device 305 is based on droop voltage associatedwith the telemetry circuit 202. However, it is to be appreciated thatthe first current-limiting device 304 and/or the second current-limitingdevice 305 can be a different type of current-limiting device. The thirdcurrent-limiting device 306 can also be a resistor or a constant currentsource. Furthermore, in certain embodiments, the third current-limitingdevice 306 can be programmable.

In an embodiment, the first current-limiting device 304 can be a firstswitch (e.g., a first low impedance switch) and the secondcurrent-limiting device 305 can be a second switch (e.g., a second lowimpedance switch). The electrical node 310 can receive current from thepower source 206. Furthermore, the electrical node 312 can receive atleast a portion of the current via the first current-limiting device 304in response to the first current-limiting device 304 being activated bythe controller 302. Alternatively, the electrical node 312 can receiveat least a portion of the current via the second current-limiting device305 in response to the second current-limiting device 305 beingactivated by the controller 302. Furthermore, the electrical node 312can receive no current in response to the first current-limiting device304 and the second current-limiting device 305 being deactivated by thecontroller 302. In another embodiment, the controller 302 can comprisefirmware to control and/or manage the first current-limiting device 304and the second current-limiting device 305. In one example, thecontroller 302 can be enabled or disabled via one or more register bitsindicative of an open/close state for the first current-limiting device304 and/or the second current-limiting device 305.

The controller 302 can connect the first current-limiting device 304 tothe telemetry circuit 202 in response to a determination that thetelemetry circuit 202 satisfies a defined criterion. For example, thecontroller 302 can connect the first current-limiting device 304 to thetelemetry circuit 202 in response to a determination that the telemetrycircuit 202 is beginning a telemetry session associated withbroadcasting one or more advertising data packets. The controller 302can determine whether the telemetry circuit 202 is broadcasting anadvertising data packet and/or is communicating with the external device116 based on a voltage level associated with the telemetry circuit 202.For example, the controller 302 can determine that the telemetry circuit202 is not broadcasting an advertising data packet and/or is notcommunicating with the external device 116 in response to adetermination that a voltage reading associated with the telemetrycircuit 202 is below a defined threshold value. The firstcurrent-limiting device 304 can be employed to limit in-rush currentprovided to the telemetry circuit 202. Furthermore, the controller 302can connect the second current-limiting device 305 to the telemetrycircuit 202 in response to a determination that the telemetry circuit202 is connected to the first current-limiting device 304 for a definedperiod of time. For example, the controller 302 can connect the secondcurrent-limiting device 305 to the telemetry circuit 202 in response toa determination that the telemetry circuit 202 has been connected to thefirst current-limiting device 304 for 10 milliseconds. In an alternateembodiment, the controller 302 can connect the second current-limitingdevice 305 to the telemetry circuit 202 in response to a determinationthat a voltage level associated with the telemetry circuit 202 and/or acurrent level associated with the telemetry circuit 202 satisfies adefined threshold value. The second current-limiting device 305 can beemployed to provide a defined switch on resistance to support a definedon-current for the telemetry circuit 202. In certain embodiments, thesoft-start sequence device 303 can include more than twocurrent-limiting devices. For example, the soft-start sequence device303 can include one or more other current-limiting devices in additionto the first current-limiting device 304 and the second current-limitingdevice 305. In one example, the power management circuit 204 can connectthe telemetry circuit 202 to the second current-limiting device 205based on a determination that the telemetry circuit 202 is connected tothe first current-limiting device 304 for a first defined period oftime, and the power management circuit 204 can connect the telemetrycircuit 202 to a third current-limiting device of the soft-startsequence device 303 based on a determination that the telemetry circuit202 is connected to the second current-limiting device 305 for a seconddefined period of time. The second defined period of time can bedifferent than the first defined period of time. Alternatively, thesecond defined period of time can correspond to the first defined periodof time. In an aspect, the first defined period of time and the seconddefined period of time can be determined based on a set of rules toprevent a brown out condition associated with the telemetry circuit 202and/or to prevent a voltage droop condition associated with thetelemetry circuit 202.

In an embodiment, the controller 302 can control the firstcurrent-limiting device 304 and/or the second current-limiting device305 by employing pulse width modulation. For instance, the controller302 can vary a duty cycle (e.g., a cycle of operation) for switching thefirst current-limiting device 304 and/or the second current-limitingdevice 305. In one example, a pulse width modulation process employed bythe controller 302 can employ a pulse width modulation algorithm thatpowers up the telemetry circuit 202 in an acceptable time whileminimizing in-rush current provided to the telemetry circuit 202. In oneexample, the controller 302 can control switching of the firstcurrent-limiting device 304 and/or the second current-limiting device305 based on a first duty cycle value. In response to a determinationthat the first duty cycle is employed for a defined period of time, thecontroller 302 can modify (e.g., increase or decrease) the first dutycycle value to facilitate controlling switching of the firstcurrent-limiting device 304 and/or the second current-limiting device305 based on a second duty cycle value. In an embodiment, the secondcurrent-limiting device 305 can be pulse width modulated to emulatecurrent restriction transitions from the first current-limiting device304 to the second current-limiting device 305. In certain embodiments,the other implantable device circuitry/hardware 208 can be employed toprovide reduced telemetry functionality for the implantable device 104.In other embodiments, the other implantable device circuitry/hardware208 can correspond to at least the embodiment(s) of the otherimplantable device circuitry/hardware 208 described in connection withFIG. 1 and/or FIG. 2. In one embodiment, the controller 302 candisconnect the telemetry circuit 202 from the power source 206 via thesoft-start sequence device 303 in response to a determination that apower supply condition associated with the other implantable devicecircuitry/hardware 208 satisfies a defined criterion. For example, inresponse to a determination that a current condition for the otherimplantable device circuitry/hardware 208 satisfies a defined currentvalue and/or that voltage provided to the telemetry circuit 202 is notsufficient for communicating with an external device (e.g., the externaldevice 116), the controller 302 can disconnect the telemetry circuit 202from the power source 206 via the soft-start sequence device 303 inorder to provide current to one or more circuits (e.g., “lifesustaining” circuitry) associated with the other implantable devicecircuitry/hardware 208. In a non-limiting example, the controller 302can be turned on for one cycle (e.g., a given time period such as, forexample, 100 μsec) and shut off for 255 cycles. In certain embodiments,the controller 302 can employ a counter to facilitate determination ofcycles for the controller 302. For example, the first current-limitingdevice 304 and/or the second current-limiting device 305 can be shut offfor 255 cycles as determined by an 8-bit counter initially set to 255,where the 8-bit counter is decreased by n (e.g., where n equals 1) foreach iteration through a counter loop for the 8-bit counter, and after mcycles through the counter loop, where m is a positive integer, thecontroller 302 can remain in an on-position. Therefore, by employing thepower management circuit 204 as more fully disclosed herein, utility andlife of the power source 206 and/or the implantable device 104 can bemaximized. Moreover, performance of the implantable device 104 can beimproved by employing the power management circuit 204 as more fullydisclosed herein.

FIG. 4 illustrates an example, non-limiting system 400 in accordancewith one or more embodiments described herein. The system 400 includesthe telemetry circuit 202, the power management circuit 204, the powersource 206, and the other implantable device circuitry/hardware 208. Forexample, the system 400 can correspond to the telemetry circuit 202, thepower management circuit 204 and the power source 206 in connection withthe implantable device 104 shown in FIG. 2. In an embodiment, the powermanagement circuit 204 can include the controller 302, the soft-startsequence device 303 (e.g., the first current-limiting device 304 and thesecond current-limiting device 305), the third current-limiting device306, the capacitor device 314 and/or the capacitor device 318.Repetitive description of like elements employed in other embodimentsdescribed herein is omitted for sake of brevity.

In the embodiment shown in FIG. 4, the power source 206 can include acurrent-limiting device 402 and an energy source 404. For example, theenergy source 404 can be a battery energy source that provides power tothe telemetry circuit 202 via the power management circuit 204. Inanother example, the energy source 404 can be a capacitor or a chargepump that stores energy and provides the stored energy to the telemetrycircuit 202 via the power management circuit 204. In yet anotherexample, the energy source 404 can be a mechanically derived powersource (e.g., a MEMs device) that that provides power to the telemetrycircuit 202 via the power management circuit 204. However, it is to beappreciated that the energy source 404 can be a different type of energysource. In an aspect, the energy source 404 can be a direct current (DC)energy source that provides DC voltage and/or DC current to thetelemetry circuit 202 via the power management circuit 204.Alternatively, the energy source 404 can be an alternating current (AC)energy source that provides AC voltage and/or AC current to thetelemetry circuit 202 via the power management circuit 204. Thecurrent-limiting device 402 can reduce current provided by the energysource 404. For instance, the current-limiting device 402 can reducecurrent provided by the energy source 404 so that current received bythe electrical node 310 of the power management circuit 204 is less thancurrent provided by the energy source 404.

FIG. 5 illustrates an example, non-limiting system 500 in accordancewith one or more embodiments described herein. The system 500 includesthe telemetry circuit 202, the power management circuit 204, the powersource 206, and the other implantable device circuitry/hardware 208. Forexample, the system 500 can correspond to the telemetry circuit 202, thepower management circuit 204 and the power source 206 in connection withthe implantable device 104 shown in FIG. 2. In the embodiment shown inFIG. 5, the power management circuit 204 can include the controller 302,the soft-start sequence device 303 (e.g., the first current-limitingdevice 304 and the second current-limiting device 305), the thirdcurrent-limiting device 306, the capacitor device 314, the capacitordevice 318, power supply monitoring 502 and system response 504. Inanother embodiment, the power source 206 can include thecurrent-limiting device 402 and the energy source 404. In certainembodiments, the controller 302 can include the power supply monitoring502 and/or the system response 504. Repetitive description of likeelements employed in other embodiments described herein is omitted forsake of brevity.

Embodiments of the power supply monitoring 502 and/or the systemresponse 504 can include circuitry and/or other hardware to facilitatemonitoring of a power condition associated with the telemetry circuit202. Additionally or alternatively, certain embodiments of the powersupply monitoring 502 and/or the system response 504 can include one ormore machine-executable components embodied within one or more machines(e.g., embodied in one or more computer-readable storage mediaassociated with one or more machines). Such components, when executed bythe one or more machines (e.g., processors, computers, computingdevices, virtual machines, etc.) can cause the one or more machines toperform the operations described.

The power supply monitoring 502 can monitor a power supply condition forpower provided to the telemetry circuit 202. For instance, the powersupply monitoring 502 can monitor a power supply condition associatedwith the electrical node 312. A power supply condition associated withthe electrical node 312 can include, for example, a voltage associatedwith the electrical node 312, a current associated with the electricalnode 312, and/or another electrical characteristic associated with theelectrical node 312. In an embodiment, the power supply monitoring 502can repeatedly monitor (e.g., continually monitor) a power supplycondition associated with the electrical node 312. For instance, thepower supply monitoring 502 can repeatedly monitor (e.g., continuallymonitor) a power supply condition associated with the electrical node312 based on an initiation of a connection between the telemetry circuit202 and the power source 206 via the power management circuit 204 (e.g.,via the first current-limiting device 304 and/or the secondcurrent-limiting device 305). In an embodiment, the power supplymonitoring 502 can employ a comparator device to repeatedly monitor(e.g., continually monitor) the power supply condition associated withthe electrical node 312. For instance, the comparator device of thepower supply monitoring 502 can compare a power supply value associatedwith the electrical node 312 to a threshold power supply value. Inresponse to a determination by the power supply monitoring 502 that thepower supply condition associated with the electrical node 312 satisfiesa defined criterion, the system response 504 can enable switching off ofthe telemetry circuit 202. For example, in response to a determinationby the power supply monitoring 502 that the power supply conditioncorresponds to a low voltage condition associated with the electricalnode 312, the system response 504 can enable switching off of thetelemetry circuit 202. In another example, in response to adetermination by the power supply monitoring 502 that the power supplycondition corresponds to a high current condition associated with theelectrical node 312, the system response 504 can enable switching off ofthe telemetry circuit 202. In yet another example, in response to adetermination by the power supply monitoring 502 that the power supplycondition corresponds to a low current condition associated with theelectrical node 312, the system response 504 can enable switching off ofthe telemetry circuit 202. In yet another example, in response to adetermination by the power supply monitoring 502 that the power supplycondition corresponds to a high current condition associated with theelectrical node 312, the system response 504 can enable switching off ofthe telemetry circuit 202.

In an alternate embodiment, in response to a determination by the powersupply monitoring 502 that the power supply condition associated withthe electrical node 312 satisfies a defined criterion, the systemresponse 504 can alter (e.g., increase or decrease) a duty cycle forswitching the first current-limiting device 304 and/or the secondcurrent-limiting device 305 via the controller 302. For example, inresponse to a determination by the power supply monitoring 502 that thepower supply condition corresponds to a low voltage condition associatedwith the electrical node 312, the system response 504 can alter a dutycycle for switching the first current-limiting device 304 and/or thesecond current-limiting device 305 via the controller 302. In anotherexample, in response to a determination by the power supply monitoring502 that the power supply condition corresponds to a high currentcondition associated with the electrical node 312, the system response504 can alter a duty cycle for switching the first current-limitingdevice 304 and/or the second current-limiting device 305 via thecontroller 302. In yet another example, in response to a determinationby the power supply monitoring 502 that the power supply conditioncorresponds to a low current condition associated with the electricalnode 312, the system response 504 can alter a duty cycle for switchingthe first current-limiting device 304 and/or the second current-limitingdevice 305 via the controller 302. In yet another example, in responseto a determination by the power supply monitoring 502 that the powersupply condition corresponds to a high current condition associated withthe electrical node 312, the system response 504 can alter a duty cyclefor switching the first current-limiting device 304 and/or the secondcurrent-limiting device 305 via the controller 302. In an embodiment, inresponse to a determination by the power supply monitoring 502 that thepower supply condition associated with the electrical node 312 satisfiesa defined criterion, the system response 504 can alter (e.g., increaseor decrease) a duty cycle for the second current-limiting device 305 toemulate a current restriction between the first current-limiting device304 and the second current-limiting device 305 so that a secondarycurrent spike is avoided when the second current-limiting device 305 isengaged.

FIGS. 6, 7, 8, 9 and 10 illustrate flow diagrams of example,non-limiting methods facilitating improved power management of animplantable device in accordance with one or more embodiments describedherein. While, for purposes of simplicity of explanation, themethodologies are shown and described as a series of acts, the disclosedsubject matter is not limited by the order of acts, as some acts canoccur in different orders and/or concurrently with other acts from thatshown and described herein. For example, those skilled in the art willunderstand and appreciate that a methodology can alternatively berepresented as a series of interrelated statuses or events, such as in astate diagram. Moreover, not all illustrated acts may be required toimplement a methodology in accordance with the disclosed subject matter.Additionally, it is to be appreciated that the methodologies disclosedin this disclosure are capable of being stored on an article ofmanufacture to facilitate transporting and transferring suchmethodologies to computers or other computing devices.

Referring now to FIG. 6, shown is a flow diagram of an example method600 facilitating improved power management of an implantable device inaccordance with one embodiment. In some embodiments of method 600, animplantable device (e.g., implantable device 104) employs a powermanagement circuit (e.g., power management circuit 204) in connectionwith a telemetry circuit (e.g., telemetry circuit 202) and/or a powersource (e.g., power source 206) to facilitate improved power managementof the implantable device. Repetitive description of like elementsemployed in other embodiments described herein is omitted for sake ofbrevity.

At 602, it can be determined by an implantable device (e.g., by thepower management circuit 204) whether a telemetry circuit of theimplantable device satisfies a defined criterion. For example, it can bedetermined whether telemetry circuit of the implantable device isbeginning a telemetry session with respect to an external device. If no,method 600 can proceed to 604. If yes, method 600 can proceed to 606. At604, a telemetry circuit can be disconnected from a power source of theimplantable device by the implantable device (e.g., using the powermanagement circuit 204). For example, a power management circuitimplemented between the power source and the telemetry circuit candisconnect a set of current-limiting devices from the telemetry circuit.At 606, a soft-start sequence with respect to a set of current-limitingdevices of the implantable device can be performed by the implantabledevice (e.g., by the power management circuit 204) to facilitateconnection of the telemetry circuit with respect to a power source ofthe implantable device. For example, a first current-limiting devicefrom the set of current-limiting devices can be connected to thetelemetry circuit to allow current from the power source to be providedto the telemetry circuit. Then, in response to a determination that thefirst current-limiting device is connected to the telemetry circuit fora defined amount of time, a first current-limiting device from the setof current-limiting devices can be connected to the telemetry circuit toallow a defined amount of current to be provided to the telemetrycircuit (e.g., a defined amount of current to allow a telemetry sessionto be executed by the telemetry circuit). In an aspect, the soft-startsequence of the set of current-limiting devices of the implantabledevice can be performed in response to a determination that telemetrycircuit is disconnected from the power source for a defined period oftime.

Referring now to FIG. 7, shown is a flow diagram of an example method700 facilitating improved power management of an implantable device inaccordance with another embodiment. In some embodiments of method 700,an implantable device (e.g., implantable device 104) employs a powermanagement circuit (e.g., power management circuit 204) in connectionwith a telemetry circuit (e.g., telemetry circuit 202) and/or a powersource (e.g., power source 206) to facilitate improved power managementof the implantable device. Repetitive description of like elementsemployed in other embodiments described herein is omitted for sake ofbrevity.

At 702, a telemetry session between an implantable device and anexternal device can be facilitated using a telemetry circuit of theimplantable device (e.g., using the telemetry circuit 202). For example,the telemetry circuit can broadcast one or more advertising datapackets. In another example, the telemetry circuit can communicate withthe external device via one or more data packets.

At 704, using a power management circuit of the implantable device(e.g., using the power management circuit 204), a power supply can beconnected to the telemetry circuit via a first current-limiting devicebased on a determination that the telemetry circuit satisfies a definedcriterion. For example, the power supply can be connected to thetelemetry circuit via the first current-limiting device in response to adetermination that the telemetry session is initiated.

At 706, using the power management circuit of the implantable device(e.g., using the power management circuit 204), the telemetry circuitcan be connected to a second current-limiting device based on adetermination that the telemetry circuit is connected to the firstcurrent-limiting device for a defined period of time. For example,resistance for current provided to the telemetry circuit can be modifiedin response to a determination that that the telemetry circuit isconnected to the first current-limiting device for a defined period oftime.

Referring now to FIG. 8, shown is a flow diagram of an example method800 facilitating improved power management of an implantable device inaccordance with yet another embodiment. In some embodiments of method800, an implantable device (e.g., implantable device 104) employs apower management circuit (e.g., power management circuit 204) inconnection with a telemetry circuit (e.g., telemetry circuit 202) and/ora power source (e.g., power source 206) to facilitate improved powermanagement of the implantable device. Repetitive description of likeelements employed in other embodiments described herein is omitted forsake of brevity.

At 802, it can be determined, using a power management circuit of animplantable device (e.g., using the power management circuit 204), thata telemetry circuit of the implantable device satisfies a first definedcriterion. For example, it can be determined that the telemetry circuitis not performing a telemetry session related to broadcasting one ormore data packets and/or communicating with respect to an externaldevice. In an embodiment, it can be determined that a voltage levelassociated with the telemetry circuit is less than a defined voltagevalue.

At 804, the telemetry circuit can be disconnected from a power source ofthe implantable device using the power management circuit of theimplantable device (e.g., using the power management circuit 204). Forexample, one or more current-limiting devices of the power managementcircuit can be disconnected from the telemetry circuit.

At 806, it can be determined, using the power management circuit of theimplantable device (e.g., using the power management circuit 204), thatthe telemetry circuit satisfies a second defined criterion. For example,it can be determined that a telemetry session (e.g., a telemetry sessionrelated to broadcasting one or more data packets and/or communicatingwith respect to an external device) is being initiated by the telemetrycircuit.

At 808, using the power management circuit of the implantable device(e.g., using the power management circuit 204), the power source can beconnected to the telemetry circuit via a first current-limiting deviceof the power management circuit. For example, a first current-limitingdevice associated with a first resistance can be connected to thetelemetry circuit.

At 810, using the power management circuit of the implantable device(e.g., using the power management circuit 204), the telemetry circuitcan be connected to a second current-limiting device of the powermanagement circuit in response to a determination that the telemetrycircuit is connected to the first current-limiting device for a definedperiod of time. For example, a second current-limiting device associatedwith a second resistance that is different than the first resistance canbe connected to the telemetry circuit in response to a determinationthat the telemetry circuit is connected to the first current-limitingdevice for a defined period of time.

Referring now to FIG. 9, shown is a flow diagram of an example method900 facilitating improved power management of an implantable device inaccordance with yet another embodiment. In some embodiments of method900, an implantable device (e.g., implantable device 104) employs apower management circuit (e.g., power management circuit 204) inconnection with a telemetry circuit (e.g., telemetry circuit 202) and/ora power source (e.g., power source 206) to facilitate improved powermanagement of the implantable device. Repetitive description of likeelements employed in other embodiments described herein is omitted forsake of brevity.

At 902, using a power management circuit of an implantable device (e.g.,using the power management circuit 204), a power supply conditionbetween a set of current-limiting devices of the power managementcircuit and a telemetry circuit of the implantable device is monitored.For example, a power supply condition between the set ofcurrent-limiting devices of the power management circuit and thetelemetry circuit of the implantable device can be repeatedly monitored.The power supply condition can include, for example, a voltagecondition, a current condition and/or another electrical characteristic.

At 904, using the set of current-limiting devices of the powermanagement circuit (e.g., using the first current-limiting device 304and the second current-limiting device 305), a power supply from thetelemetry circuit is disconnected in response to a determination thatthe power supply condition satisfies a defined criterion. For example,the power supply can be disconnected from the telemetry circuit inresponse to a determination that the power supply condition is above orbelow a defined threshold value for the power supply condition.

Referring now to FIG. 10, shown is a flow diagram of an example method1000 facilitating improved power management of an implantable device inaccordance with yet another embodiment. In some embodiments of method1000, an implantable device (e.g., implantable device 104) employs apower management circuit (e.g., power management circuit 204) inconnection with a telemetry circuit (e.g., telemetry circuit 202) and/ora power source (e.g., power source 206) to facilitate improved powermanagement of the implantable device. Repetitive description of likeelements employed in other embodiments described herein is omitted forsake of brevity.

At 1002, using a power management circuit of an implantable device(e.g., using the power management circuit 204), a power supply conditionbetween a set of current-limiting devices of the power managementcircuit and a telemetry circuit of the implantable device is monitored.For example, a power supply condition between the set ofcurrent-limiting devices of the power management circuit and thetelemetry circuit of the implantable device can be repeatedly monitored.The power supply condition can include, for example, a voltagecondition, a current condition and/or another electrical characteristic.

At 1004, using the power management circuit of the implantable device(e.g., using the power management circuit 204), a power supply isdisconnected from the telemetry circuit in response to a determinationthat the power supply condition satisfies a first defined criterion. Forexample, the power supply can be disconnected from the telemetry circuitin response to a determination that the power supply condition is aboveor below a defined threshold value for the power supply condition.

At 1006, using the power management circuit of the implantable device(e.g., using the power management circuit 204), it can be determinedthat the telemetry circuit satisfies a second defined criterion. Forexample, it can be determined that a telemetry session (e.g., atelemetry session related to broadcasting one or more data packetsand/or communicating with respect to an external device) is beinginitiated by the telemetry circuit previously disconnected from thepower supply.

At 1008, using the power management circuit of the implantable device(e.g., using the power management circuit 204), the power supply isconnected to the telemetry circuit via a first current-limiting deviceof the set of current-limiting devices. For example, a firstcurrent-limiting device associated with a first resistance can beconnected to the telemetry circuit to allow current from the powersupply to be provided to the telemetry circuit.

At 1010, using the power management circuit of the implantable device(e.g., using the power management circuit 204), the telemetry circuit isconnected to a second current-limiting device of the set ofcurrent-limiting devices in response to a determination that thetelemetry circuit is connected to the first current-limiting device fora defined period of time. For example, in response to a determinationthat the telemetry circuit is connected to the first current-limitingdevice for a defined period of time, a second current-limiting deviceassociated with a second resistance that is different than the firstresistance can be connected to the telemetry circuit to allow adifferent amount of the current from the power supply to be provided tothe telemetry circuit.

FIG. 11 illustrates a block diagram of a computer operable to facilitateimproved power management of an implantable device in accordance withone or more embodiments described herein. For example, in someembodiments, the computer can be or be included within implantabledevice 104 and/or external device 116 (or any component of theimplantable device 104 and/or external device 116).

Repetitive description of like elements employed in other embodimentsdescribed herein is omitted for sake of brevity.

In order to provide additional context for one or more embodimentsdescribed herein, FIG. 11 and the following discussion are intended toprovide a brief, general description of a suitable computing environment1100 in which the one or more embodiments described herein can beimplemented.

Generally, program modules include routines, programs, components, datastructures, etc., that perform particular tasks or implement particularabstract data types. Moreover, those skilled in the art will appreciatethat the inventive methods can be practiced with other computer systemconfigurations, including single-processor or multiprocessor computersystems, minicomputers, mainframe computers, as well as personalcomputers, hand-held computing devices, microprocessor-based orprogrammable consumer electronics, and the like, each of which can beoperatively coupled to one or more associated devices.

Computing devices typically include a variety of media, which caninclude computer-readable storage media and/or communications media,which two terms are used herein differently from one another as follows.Computer-readable storage media can be any available storage media thatcan be accessed by the computer and includes both volatile andnonvolatile media, removable and non-removable media. By way of example,and not limitation, computer-readable storage media can be implementedin connection with any method or technology for storage of informationsuch as computer-readable instructions, program modules, structured dataor unstructured data. Tangible and/or non-transitory computer-readablestorage media can include, but are not limited to, random access memory(RAM), read only memory (ROM), electrically erasable programmable readonly memory (EEPROM), flash memory or other memory technology, compactdisk read only memory (CD ROM), digital versatile disk (DVD) or otheroptical disk storage, magnetic cassettes, magnetic tape, magnetic diskstorage, other magnetic storage devices and/or other media that can beused to store desired information. Computer-readable storage media canbe accessed by one or more local or remote computing devices, e.g., viaaccess requests, queries or other data retrieval protocols, for avariety of operations with respect to the information stored by themedium.

In this regard, the term “tangible” herein as applied to storage,memory, computer-readable media or computer-readable storage media, isto be understood to exclude only propagating intangible signals per seas a modifier and does not relinquish coverage of all standard storage,memory, computer-readable media or computer-readable storage media thatare not only propagating intangible signals per se. In this regard, theterm “non-transitory” herein as applied to storage, memory,computer-readable media or computer-readable storage media, is to beunderstood to exclude only propagating transitory signals per se as amodifier and does not relinquish coverage of all standard storage,memory, computer-readable media or computer-readable storage media thatare not only propagating transitory signals per se.

Communications media typically embody computer-readable instructions,data structures, program modules or other structured or unstructureddata in a data signal such as a modulated data signal, e.g., a channelwave or other transport mechanism, and includes any information deliveryor transport media. The term “modulated data signal” or signals refersto a signal that has one or more of the data signal's characteristicsset or changed in such a manner as to encode information in one or moresignals. By way of example, and not limitation, communication mediainclude wired media, such as a wired network or direct-wired connection,and wireless media such as acoustic, RF, infrared and other wirelessmedia.

With reference again to FIG. 11, example environment 1100 forimplementing one or more embodiments of the embodiments described hereinincludes computer 1102, computer 1102 including processing unit 1104,system memory 1106 and system bus 1108. System bus 1108 couples systemcomponents including, but not limited to, system memory 1106 toprocessing unit 1104. Processing unit 1104 can be any of variouscommercially available processors. Dual microprocessors and other multiprocessor architectures can also be employed as processing unit 1104.

System bus 1108 can be any of several types of bus structure that canfurther interconnect to a memory bus (with or without a memorycontroller), a peripheral bus, and a local bus using any of a variety ofcommercially available bus architectures. System memory 1106 includesRAM 1110 and ROM 1112. A basic input/output system (BIOS) can be storedin a non-volatile memory such as ROM, erasable programmable read onlymemory (EPROM), EEPROM, which BIOS contains the basic routines that helpto transfer information between elements within computer 1102, such asduring startup. RAM 1110 can also include a high-speed RAM such asstatic RAM for caching data.

Computer 1102 further includes internal hard disk drive (HDD) 1114(e.g., Enhanced Integrated Drive Electronics (EIDE), Serial AdvancedTechnology Attachment (SATA)). HDD 1114 can be connected to system bus1108 by hard disk drive interface 1116. The drives and their associatedcomputer-readable storage media provide nonvolatile storage of data,data structures, computer-executable instructions, and so forth. Forcomputer 1102, the drives and storage media accommodate the storage ofany data in a suitable digital format.

A number of program modules can be stored in the drives and RAM 1110,including operating system 1136, one or more application programs 1138,other program modules 1140 and program data 1142. All or portions of theoperating system, applications, modules, and/or data can also be cachedin RAM 1110. The systems and methods described herein can be implementedutilizing various commercially available operating systems orcombinations of operating systems.

A mobile device can enter commands and information into computer 1102through one or more wireless input devices, e.g., wireless keyboard 1128and a pointing device, such as wireless mouse 1130. Other input devices(not shown) can include a smart phone, tablet, laptop, wand, wearabledevice or the like. These and other input devices are often connected tothe processing unit 1104 through input device interface 1118 that can becoupled to system bus 1108, but can be connected by other interfaces,such as a parallel port, an IEEE serial port, a game port and/or auniversal serial bus (USB) port.

Computer 1102 can operate in a networked environment using logicalconnections via wired and/or wireless communications to one or moreremote computers, such as remote computer(s) 1132. Remote computer(s)1132 can be a workstation, a server computer, a router, a personalcomputer, portable computer, microprocessor-based entertainmentappliance, a peer device or other common network node, and typicallyincludes many or all of the elements described relative to computer1102, although, for purposes of brevity, only memory/storage device 1134is illustrated. The logical connections depicted include wired/wirelessconnectivity to a local area network (LAN) 1126 and/or larger networks,e.g., WAN 1124, as well as smaller PANs involving a few devices (e.g.,at least two). LAN and WAN networking environments are commonplace inthe home, offices (e.g., medical facility offices, hospital offices) andcompanies, and facilitate enterprise-wide computer networks, such asintranets, all of which can connect to a global communications network(e.g., the Internet).

When used in a LAN networking environment, computer 1102 can beconnected to local network through a wired and/or wireless communicationnetwork interface or adapter 1120. Adapter 1120 can facilitate wired orwireless communication to LAN 1126, which can also include a wirelessaccess point (AP) connected to the LAN 1126 for communicating withadapter 1120.

When used in a WAN networking environment, computer 1102 can includemodem 1122 or can be connected to a communications server on WAN 1124 orhas other means for establishing communications over WAN 1124, such asby way of the Internet. Modem 1122, which can be internal or externaland a wired or wireless device, can be connected to system bus 1108 viainput device interface 1118. In a networked environment, program modulesdepicted relative to computer 1102 or portions thereof, can be stored ina remote memory/storage device. It will be appreciated that the networkconnections shown are example and other means of establishing acommunications link between the computers can be used.

Computer 1102 can be operable to communicate with any wireless devicesor entities operatively disposed in wireless communication via anynumber of protocols, including, but not limited to, NFC, Wi-Fi and/orBLUETOOTH® wireless protocols. Thus, the communication can be a definedstructure as with a conventional network or simply an ad hoccommunication between at least two devices.

NFC can allow point-to-point connection to an NFC-enabled device in theNFC field of an IMD within the home or at any location. NFC technologycan be facilitated using an NFC-enabled smart phone, tablet or otherdevice that can be brought within 3-4 centimeters of an implanted NFCcomponent. NFC typically provides a maximum data rate of 424 kilobitsper second (Kbps), although data rates can range from 6.67 Kbps to 828Kbps. NFC typically operates at the frequency of 13.56 megahertz (MHz).NFC technology communication is typically over a range not exceeding 0.2meters (m) and setup time can be less than 0.1 seconds. Low power (e.g.,15 milliamperes (mAs)) reading of data can be performed by an NFCdevice.

Wi-Fi can allow connection to the Internet from a couch at home, a bedin a hotel room or a conference room at work, without wires. Wi-Fi is awireless technology similar to that used in a cell phone that enablessuch devices, e.g., computers, to send and receive data indoors and out.Wi-Fi networks use radio technologies called IEEE 802.11 (a, b, g, n,etc.) to provide secure, reliable, fast wireless connectivity. A Wi-Finetwork can be used to connect computers to each other, to the Internet,and to wired networks (which can use IEEE 802.3 or Ethernet). Wi-Finetworks operate in the unlicensed 2.4 and 5 GHz radio bands, at an 11Mbps (802.11a) or 54 Mbps (802.11b) data rate, for example or withproducts that contain both bands (dual band), so the networks canprovide real-world performance similar to the basic 10BaseT wiredEthernet networks used in many offices.

The embodiments of devices described herein can employ artificialintelligence (AI) to facilitate automating one or more featuresdescribed herein. The embodiments (e.g., in connection withautomatically identifying acquired cell sites that provide a maximumvalue/benefit after addition to an existing communication network) canemploy various AI-based schemes for carrying out one or more embodimentsthereof. Moreover, the classifier can be employed to determine a rankingor priority of each cell site of an acquired network. A classifier is afunction that maps an input attribute vector, x=(x1, x2, x3, x4, xn), toa confidence that the input belongs to a class, that is,f(x)=confidence(class). Such classification can employ a probabilisticand/or statistical-based analysis (e.g., factoring into the analysisutilities and costs) to prognose or infer an action that a mobile devicedesires to be automatically performed. A support vector machine (SVM) isan example of a classifier that can be employed. The SVM operates byfinding a hypersurface in the space of possible inputs, which thehypersurface attempts to split the triggering criteria from thenon-triggering events. Intuitively, this makes the classificationcorrect for testing data that is near, but not identical to trainingdata. Other directed and undirected model classification approachesinclude, e.g., naïve Bayes, Bayesian networks, decision trees, neuralnetworks, fuzzy logic models, and probabilistic classification modelsproviding different patterns of independence can be employed.Classification as used herein also is inclusive of statisticalregression that is utilized to develop models of priority.

As will be readily appreciated, one or more of the embodiments canemploy classifiers that are explicitly trained (e.g., via a generictraining data) as well as implicitly trained (e.g., via observing mobiledevice behavior, operator preferences, historical information, receivingextrinsic information). For example, SVMs can be configured via alearning or training phase within a classifier constructor and featureselection module. Thus, the classifier(s) can be used to automaticallylearn and perform a number of functions, including but not limited todetermining according to a predetermined criteria which of the acquiredcell sites will benefit a maximum number of subscribers and/or which ofthe acquired cell sites will add minimum value to the existingcommunication network coverage, etc.

As employed herein, the term “processor” can refer to substantially anycomputing processing unit or device including, but not limited to,single-core processors; single-processors with software multithreadexecution capability; multi-core processors; multi-core processors withsoftware multithread execution capability; multi-core processors withhardware multithread technology; parallel platforms; and parallelplatforms with distributed shared memory. Additionally, a processor canrefer to an integrated circuit, an application specific integratedcircuit (ASIC), a digital signal processor (DSP), a field programmablegate array (FPGA), a programmable logic controller (PLC), a complexprogrammable logic device (CPLD), a discrete gate or transistor logic,discrete hardware components or any combination thereof designed toperform the functions described herein. Processors can exploitnano-scale architectures such as, but not limited to, molecular andquantum-dot based transistors, switches and gates, in order to optimizespace usage or enhance performance of mobile device equipment. Aprocessor can also be implemented as a combination of computingprocessing units.

Memory disclosed herein can include volatile memory or nonvolatilememory or can include both volatile and nonvolatile memory. By way ofillustration, and not limitation, nonvolatile memory can include ROM,programmable ROM (PROM), electrically programmable ROM (EPROM),electrically erasable PROM (EEPROM) or flash memory. Volatile memory caninclude RAM, which acts as external cache memory. By way of illustrationand not limitation, RAM is available in many forms such as static RAM(SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rateSDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), Synchlink DRAM (SLDRAM), anddirect Rambus RAM (DRRAM). The memory (e.g., data storages, databases)of the embodiments is intended to include, without being limited to,these and any other suitable types of memory.

As used herein, terms such as “data storage,” “database,” andsubstantially any other information storage component relevant tooperation and functionality of a component, refer to “memorycomponents,” or entities embodied in a “memory” or components includingthe memory. It will be appreciated that the memory components orcomputer-readable storage media, described herein can be either volatilememory or nonvolatile memory or can include both volatile andnonvolatile memory.

In addition, the words “example” and “exemplary” are used herein to meanserving as an instance or illustration. Any embodiment or designdescribed herein as “example” or “exemplary” is not necessarily to beconstrued as preferred or advantageous over other embodiments ordesigns. Rather, use of the word “example” or “exemplary” is intended topresent concepts in a concrete fashion. As used in this application, theterm “or” is intended to mean an inclusive “or” rather than an exclusive“or”. That is, unless specified otherwise or clear from context, “Xemploys A or B” is intended to mean any of the natural inclusivepermutations. That is, if X employs A; X employs B; or X employs both Aand B, then “X employs A or B” is satisfied under any of the foregoinginstances. In addition, the articles “a” and “an” as used in thisapplication should generally be construed to mean “one or more” unlessspecified otherwise or clear from context to be directed to a singularform. The terms “first,” “second,” “third,” and so forth, as used in theclaims and description, unless otherwise clear by context, is forclarity only and doesn't necessarily indicate or imply any order intime.

What has been described above includes mere examples of one or moreembodiments. It is, of course, not possible to describe everyconceivable combination of components or methodologies for purposes ofdescribing these examples, but one of ordinary skill in the art canrecognize that many further combinations and permutations of the presentembodiments are possible. Accordingly, the embodiments disclosed and/orclaimed herein are intended to embrace all such alterations,modifications and variations that fall within the spirit and scope ofthe detailed description and the appended claims. Furthermore, to theextent that the term “includes” is used in either the detaileddescription or the claims, such term is intended to be inclusive in amanner similar to the term “comprising” as “comprising” is interpretedwhen employed as a transitional word in a claim.

What is claimed is:
 1. An implantable device configured to be at leastpartially implanted within a patient, comprising: a housing configuredto be implanted at least partially within the patient; a memory withinthe housing; circuitry, within the housing, and configured to at leastone of obtain sensed physiological data associated with the patient ordeliver a therapy to the patient; a telemetry circuit configured tofacilitate a telemetry session between the implantable device and anexternal device; and a power management circuit configured to connect apower supply to the telemetry circuit via a first current-limitingdevice based on a determination that the telemetry circuit satisfies adefined criterion, wherein the power management circuit is configured toconnect the telemetry circuit to a second current-limiting device basedon a determination that the telemetry circuit is connected to the firstcurrent-limiting device for a defined period of time.
 2. The implantabledevice of claim 1, wherein the defined criterion is a first definedcriterion, and wherein the power management circuit is furtherconfigured to disconnect the telemetry circuit from the secondcurrent-limiting device based on a determination that a power supplycondition associated with the telemetry circuit satisfies a seconddefined criterion.
 3. The implantable device of claim 2, wherein thefirst defined criterion is associated with a telemetry session with anexternal device, and wherein the second defined criterion is a definedvoltage level or a defined current level.
 4. The implantable device ofclaim 1, wherein the defined period of time is a first defined period oftime, wherein the power management circuit is configured to connect thetelemetry circuit to a third current-limiting device based on adetermination that the telemetry circuit is connected to the secondcurrent-limiting device for a second defined period of time, and whereinthe first current-limiting device, the second current-limiting deviceand the third current-limiting device are resistors or are constantcurrent sources.
 5. The implantable device of claim 1, wherein thedefined criterion is a first defined criterion, and wherein the powermanagement circuit is further configured to alter a duty cycle of thesecond current-limiting device based on a determination that powersupply condition associated with the telemetry circuit satisfies asecond defined criterion.
 6. The implantable device of claim 1, whereinthe power management circuit is further configured to repeatedly monitora voltage level associated with the telemetry circuit based on aninitiation of a connection between the telemetry circuit and the powersupply via the second current-limiting device, and wherein the powermanagement circuit is further configured to disconnect the power supplyfrom the telemetry circuit based on a determination that the voltagelevel satisfies a defined voltage level.
 7. The implantable device ofclaim 1, wherein the power management circuit is further configured todisconnect the power supply from the telemetry circuit based on adetermination that the telemetry circuit has failed to communicate withan external device.
 8. The implantable device of claim 1, wherein thepower management circuit is further configured to disconnect the powersupply from the telemetry circuit based on a determination that thetelemetry circuit has failed to broadcast an advertising data packet. 9.The implantable device of claim 1, wherein the telemetry circuit isfurther configured to communicate with the external device via acommunication channel associated with a communication protocol utilizinga level of energy consumption that is less than a defined threshold. 10.A method, comprising: facilitating, using a telemetry circuit of animplantable device, a telemetry session between the implantable deviceand an external device; connecting, using a power management circuit ofthe implantable device, a power supply to the telemetry circuit via afirst current-limiting device based on a determination that thetelemetry circuit satisfies a first defined criterion; and connecting,using the power management circuit of the implantable device, thetelemetry circuit to a second current-limiting device based on adetermination that the telemetry circuit is connected to the firstcurrent-limiting device for a defined period of time.
 11. The method ofclaim 10, further comprising disconnecting, using the power managementcircuit of the implantable device, the telemetry circuit from the powersupply in response to determining that the telemetry circuit of theimplantable device satisfies a second defined criterion.
 12. The methodof claim 10, further comprising altering, using the power managementcircuit of the implantable device, a duty cycle of the secondcurrent-limiting device in response to determining that the telemetrycircuit of the implantable device satisfies a second defined criterion.13. The method of claim 10, further comprising: monitoring, using thepower management circuit of the implantable device, a power supplycondition associated with the telemetry circuit; and disconnecting,using the power management circuit of the implantable device, thetelemetry circuit from the power supply in response to determining thatthe power supply condition satisfies a defined power supply level. 14.The method of claim 13, wherein the monitoring comprises repeatedlymonitoring the power supply condition associated with the telemetrycircuit.
 15. A method, comprising: determining, using a power managementcircuit of an implantable device, that a telemetry circuit of theimplantable device satisfies a first defined criterion; disconnecting,using the power management circuit of the implantable device, thetelemetry circuit from a power source of the implantable device, whereinthe disconnecting is performed based on the determining that thetelemetry circuit satisfies the first defined criterion; determining,using the power management circuit of the implantable device, that thetelemetry circuit satisfies a second defined criterion; and connecting,using the power management circuit of the implantable device, the powersource to the telemetry circuit via a first current-limiting device ofthe power management circuit, wherein the connecting is performed basedon the determining that the telemetry circuit satisfies the seconddefined criterion.
 16. The method of claim 15, further comprisingconnecting, using the power management circuit of the implantabledevice, the telemetry circuit to a second current-limiting device of thepower management circuit based on a determination that the telemetrycircuit is connected to the first current-limiting device for a definedperiod of time.
 17. The method of claim 15, wherein the determining thatthe telemetry circuit satisfies the first defined criterion comprisesdetermining that a power condition associated with the telemetry circuitsatisfies a defined power condition.
 18. The method of claim 15, whereinthe determining that the telemetry circuit satisfies the first definedcriterion comprises repeatedly monitoring an electrical node associatedwith the telemetry circuit.
 19. The method of claim 15, wherein thedetermining that the telemetry circuit satisfies a defined criterioncomprises the determining that the telemetry circuit satisfies thesecond defined criterion comprises determining that the telemetrycircuit is beginning a telemetry session with respect to an externaldevice.
 20. An apparatus, comprising: a telemetry circuit configured toperform a telemetry session associated with a device; a power sourceconfigured to provide power to the telemetry circuit; and a powermanagement circuit configured to connect the power source to thetelemetry circuit via a first current-limiting device based on adetermination that the telemetry circuit satisfies a defined criterion,wherein the power management circuit is configured to connect thetelemetry circuit to a second current-limiting device based on adetermination that the telemetry circuit is connected to the powersource for a defined period of time.
 21. The apparatus of claim 20,wherein the apparatus further comprises an implantable device circuitconfigured to generate medical treatment data associated with theapparatus.
 22. The apparatus of claim 20, wherein the defined criterionis a first defined criterion, and wherein the power management circuitis further configured to disconnect the telemetry circuit from the powersource based on a determination that a power supply condition associatedwith the telemetry circuit satisfies a second defined criterion.
 23. Theapparatus of claim 20, wherein the power management circuit is furtherconfigured to repeatedly monitor the telemetry circuit based on aninitiation of a connection between the telemetry circuit and the powersource.
 24. The apparatus of claim 20, wherein the telemetry circuit isconfigured to communicate with the device via a communication protocolutilizing a level of energy consumption that is less than a definedthreshold.
 25. The apparatus of claim 20, wherein the apparatus is animplantable medical device configured to be implanted at least partiallywithin a patient.
 26. A system, comprising: an implantable devicecomprising: a telemetry circuit configured to broadcast one or moreadvertising data packets; and a power management circuit configured toconnect a power source to the telemetry circuit via a firstcurrent-limiting device based on a determination that the telemetrycircuit satisfies a defined criterion, wherein the power managementcircuit is configured to connect the telemetry circuit to a secondcurrent-limiting device based on a determination that the telemetrycircuit is connected to the power source for a defined period of time;and an external device configured to perform telemetry communicationwith the implantable device based on the one or more advertising datapackets.
 27. The system claim 26, wherein the power management circuitis configured to connect the telemetry circuit to the secondcurrent-limiting device based on a determination that the firstcurrent-limiting device is connected to the power source for the definedperiod of time.
 28. The system claim 26, wherein the power managementcircuit is configured to alter an amount of current provided to thetelemetry circuit based on the determination that the telemetry circuitis connected to the power source for the defined period of time.
 29. Thesystem claim 26, wherein the power management circuit is configured torepeatedly monitor a power condition associated with the firstcurrent-limiting device and the telemetry circuit.
 30. The system claim29, wherein the power management circuit is configured to disconnect thetelemetry circuit from the power source based on a determination thatthe power condition satisfied a defined threshold value.